java开发_jcrop_网页截图工具(插件)

今天给大家介绍一下一个web 中经常会用到的截图(如：头像等)工具：

Jcrop

项目结构：

效果图：

这个很有用：

看到这些，大家也想自己试试吧

===========================================

代码部分：

===========================================

准备工作：

下载：Jcrop-0.9.10 (zip format)

解压后放入到你的项目里面，就如上面的项目结构一样...

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial1.html

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 2   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 3 <html xmlns="http://www.w3.org/1999/xhtml">
 4   <head>
 5     <meta http-equiv="Content-type" content="text/html;charset=UTF-8" /> 
 6     <title>Jcrop &raquo; Tutorials &raquo; Hello World</title>
 7     <script src="../js/jquery.min.js" type="text/javascript"></script>
 8     <script src="../js/jquery.Jcrop.js" type="text/javascript"></script>
 9     <link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" />
10     <link rel="stylesheet" href="demo_files/demos.css" type="text/css" />
11     <script type="text/javascript">
12 
13     jQuery(function($){
14 
15       // How easy is this??
16       $('#target').Jcrop();
17 
18     });
19 
20     </script>
21   </head>
22 
23   <body>
24     <div id="outer">
25     <div class="jcExample">
26     <div class="article">
27 
28       <h1>Jcrop - Hello World</h1>
29       <img src="demo_files/pool.jpg" id="target" alt="Flowers" />
30 
31       <p>
32         <b>This example demonstrates the default behavior of Jcrop.</b>
33         Since no event handlers have been attached it only performs
34         the cropping behavior.
35       </p>
36 
37       <div id="dl_links">
38         <a href="http://deepliquid.com/content/Jcrop.html">Jcrop Home</a> |
39         <a href="http://deepliquid.com/content/Jcrop_Manual.html">Manual (Docs)</a>
40       </div>
41 
42     </div>
43     </div>
44     </div>
45   </body>
46 </html>

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial2.html

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 2   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 3 <html xmlns="http://www.w3.org/1999/xhtml">
 4   <head>
 5     <meta http-equiv="Content-type" content="text/html;charset=UTF-8" /> 
 6     <title>Jcrop &raquo; Tutorials &raquo; Event Handler</title>
 7     <script src="../js/jquery.min.js" type="text/javascript"></script>
 8     <script src="../js/jquery.Jcrop.js" type="text/javascript"></script>
 9     <link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" />
10     <link rel="stylesheet" href="demo_files/demos.css" type="text/css" />
11     <script type="text/javascript">
12 
13     jQuery(function($){
14 
15       $('#target').Jcrop({
16         onChange:   showCoords,
17         onSelect:   showCoords,
18         onRelease:  clearCoords
19       });
20 
21     });
22 
23     // Simple event handler, called from onChange and onSelect
24     // event handlers, as per the Jcrop invocation above
25     function showCoords(c)
26     {
27       $('#x1').val(c.x);
28       $('#y1').val(c.y);
29       $('#x2').val(c.x2);
30       $('#y2').val(c.y2);
31       $('#w').val(c.w);
32       $('#h').val(c.h);
33     };
34 
35     function clearCoords()
36     {
37       $('#coords input').val('');
38     };
39 
40     </script>
41   </head>
42   <body>
43   <div id="outer">
44   <div class="jcExample">
45   <div class="article">
46 
47     <h1>Jcrop - Event Handlers</h1>
48 
49     <!-- This is the image we're attaching Jcrop to -->
50     <img src="demo_files/pool.jpg" id="target" alt="Flowers" />
51 
52     <!-- This is the form that our event handler fills -->
53     <form id="coords"
54       class="coords"
55       onsubmit="return false;"
56       action="http://example.com/post.php">
57 
58       <div>
59       <label>X1 <input type="text" size="4" id="x1" name="x1" /></label>
60       <label>Y1 <input type="text" size="4" id="y1" name="y1" /></label>
61       <label>X2 <input type="text" size="4" id="x2" name="x2" /></label>
62       <label>Y2 <input type="text" size="4" id="y2" name="y2" /></label>
63       <label>W <input type="text" size="4" id="w" name="w" /></label>
64       <label>H <input type="text" size="4" id="h" name="h" /></label>
65       </div>
66     </form>
67 
68     <p>
69       <b>An example with a basic event handler.</b> Here we've tied
70       several form values together with a simple event handler invocation.
71       The result is that the form values are updated in real-time as
72       the selection is changed using Jcrop's <em>onChange</em> handler.
73     </p>
74 
75     <p>
76       That's how easily Jcrop can be integrated into a traditional web form!
77     </p>
78 
79     <div id="dl_links">
80       <a href="http://deepliquid.com/content/Jcrop.html">Jcrop Home</a> |
81       <a href="http://deepliquid.com/content/Jcrop_Manual.html">Manual (Docs)</a>
82     </div>
83 
84 
85   </div>
86   </div>
87   </div>
88   </body>
89 
90 </html>

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial3.html

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 2   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 3 <html xmlns="http://www.w3.org/1999/xhtml">
 4 <head>
 5 <meta http-equiv="Content-type" content="text/html;charset=UTF-8" />
 6 <title>Jcrop &raquo; Tutorials &raquo; aspectRatio w/ Preview</title>
 7 <script src="../js/jquery.min.js" type="text/javascript"></script>
 8 <script src="../js/jquery.Jcrop.js" type="text/javascript"></script>
 9 <link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" />
10 <link rel="stylesheet" href="demo_files/demos.css" type="text/css" />
11 <script type="text/javascript">
12     jQuery(function($) {
13 
14         // Create variables (in this scope) to hold the API and image size
15         var jcrop_api, boundx, boundy;
16 
17         $('#target').Jcrop({
18             onChange : updatePreview,
19             onSelect : updatePreview,
20             aspectRatio : 1
21         }, function() {
22             // Use the API to get the real image size
23             var bounds = this.getBounds();
24             boundx = bounds[0];
25             boundy = bounds[1];
26             // Store the API in the jcrop_api variable
27             jcrop_api = this;
28         });
29 
30         function updatePreview(c) {
31             if (parseInt(c.w) > 0) {
32                 var rx = 100 / c.w;
33                 var ry = 100 / c.h;
34 
35                 $('#preview').css({
36                     width : Math.round(rx * boundx) + 'px',
37                     height : Math.round(ry * boundy) + 'px',
38                     marginLeft : '-' + Math.round(rx * c.x) + 'px',
39                     marginTop : '-' + Math.round(ry * c.y) + 'px'
40                 });
41             }
42         }
43         ;
44 
45     });
46 </script>
47 
48 </head>
49 
50 <body>
51 
52   <div id="outer">
53     <div class="jcExample">
54       <div class="article">
55 
56         <h1>Jcrop - Aspect ratio w/ preview pane</h1>
57 
58         <table>
59           <tr>
60             <td>
61               <div style=" 500px; height: 370px; overflow: hidden;">
62                 <img src="demo_files/pool.jpg" id="target" alt="Flowers" style=" 500px; height: 370px;"/>
63               </div>
64             </td>
65 
66             <td>
67               <div style=" 100px; height: 100px; overflow: hidden;">
68                 <img src="demo_files/pool.jpg" id="preview" alt="Preview" class="jcrop-preview" />
69               </div>
70             </td>
71           </tr>
72         </table>
73 
74         <p>
75           <b>An example implementing a preview pane.</b> Obviously the most visual demo, the preview pane is accomplished entirely outside of Jcrop with a simple jQuery-flavored callback. This type of interface could be useful for creating a thumbnail or avatar. The onChange event handler is used to update the view in the preview pane.
76         </p>
77 
78         <div id="dl_links">
79           <a href="http://deepliquid.com/content/Jcrop.html">Jcrop Home</a> | <a href="http://deepliquid.com/content/Jcrop_Manual.html">Manual (Docs)</a>
80         </div>
81 
82 
83       </div>
84     </div>
85   </div>
86 </body>
87 
88 </html>

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial4.html

  1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  2   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  3 <html xmlns="http://www.w3.org/1999/xhtml">
  4   <head>
  5     <meta http-equiv="Content-type" content="text/html;charset=UTF-8" /> 
  6     <title>Jcrop &raquo; Tutorials &raquo; Animations / Transitions</title>
  7     <script src="../js/jquery.min.js" type="text/javascript"></script>
  8     <script src="../js/jquery.Jcrop.js" type="text/javascript"></script>
  9     <script src="../js/jquery.color.js" type="text/javascript"></script>
 10     <link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" />
 11     <link rel="stylesheet" href="../css/jquery.Jcrop.extras.css" type="text/css" />
 12     <link rel="stylesheet" href="demo_files/demos.css" type="text/css" />
 13 
 14     <script type="text/javascript">
 15 
 16       jQuery(function($){
 17 
 18         var jcrop_api;
 19 
 20         $('#target').Jcrop({
 21           bgFade:     true,
 22           bgOpacity: .3,
 23           setSelect: [ 60, 70, 540, 330 ]
 24         },function(){
 25           jcrop_api = this;
 26         });
 27 
 28         $('#fadetog').change(function(){
 29           jcrop_api.setOptions({
 30             bgFade: this.checked
 31           });
 32         }).attr('checked','checked');
 33 
 34         $('#shadetog').change(function(){
 35           if (this.checked) $('#shadetxt').slideDown();
 36             else $('#shadetxt').slideUp();
 37           jcrop_api.setOptions({
 38             shade: this.checked
 39           });
 40         }).attr('checked',false);
 41 
 42         // Define page sections
 43         var sections = {
 44           anim_buttons: 'Animate Selection',
 45           bgo_buttons: 'Change bgOpacity',
 46           bgc_buttons: 'Change bgColor'
 47         };
 48         // Define animation buttons
 49         var ac = {
 50           anim1: [217,122,382,284],
 51           anim2: [20,20,580,380],
 52           anim3: [24,24,176,376],
 53           anim4: [347,165,550,355],
 54           anim5: [136,55,472,183]
 55         };
 56         // Define bgOpacity buttons
 57         var bgo = {
 58           Low: .2,
 59           Mid: .5,
 60           High: .8,
 61           Full: 1
 62         };
 63         // Define bgColor buttons
 64         var bgc = {
 65           Red: '#900',
 66           Blue: '#4BB6F0',
 67           Yellow: '#F0B207',
 68           Green: '#46B81C',
 69           White: 'white',
 70           Black: 'black'
 71         };
 72         // Create fieldset targets for buttons
 73         for(i in sections)
 74           insertSection(i,sections[i]);
 75 
 76         // Create animation buttons
 77         for(i in ac) {
 78           $('#anim_buttons').append(
 79             $('<button />').append(i).click(animHandler(ac[i])), ' '
 80           );
 81         }
 82         // Create bgOpacity buttons
 83         for(i in bgo) {
 84           $('#bgo_buttons').append(
 85             $('<button />').append(i).click(setoptHandler('bgOpacity',bgo[i])), ' '
 86           );
 87         }
 88         // Create bgColor buttons
 89         for(i in bgc) {
 90           $('#bgc_buttons').append(
 91             $('<button />').append(i).css({
 92               backgroundColor: bgc[i],
 93               color: ((i == 'Black') || (i == 'Red'))?'white':'black'
 94             }).click(setoptHandler('bgColor',bgc[i])), ' '
 95           );
 96         }
 97         // Function to insert named sections into interface
 98         function insertSection(k,v) {
 99           $('#interface').append(
100             $('<fieldset></fieldset>').attr('id',k).append(
101               $('<legend></legend>').append(v)
102             )
103           );
104         };
105         // Handler for option-setting buttons
106         function setoptHandler(k,v) {
107           return function() {
108             var opt = { };
109             opt[k] = v;
110             jcrop_api.setOptions(opt);
111             return false;
112           };
113         };
114         // Handler for animation buttons
115         function animHandler(v) {
116           return function() {
117             jcrop_api.animateTo(v);
118             return false;
119           };
120         };
121 
122         $('#anim_buttons').append(
123           $('<button></button>').append('Bye!').click(function(){
124             jcrop_api.animateTo(
125               [300,200,300,200],
126               function(){ this.release(); }
127             );
128             return false;
129           })
130         );
131 
132         $('#interface').show();
133 
134       });
135 
136     </script>
137 
138   </head>
139 
140   <body>
141     <div id="outer">
142     <div class="jcExample">
143     <div class="article">
144 
145       <h1>Jcrop - Animations/Transitions</h1>
146       <img src="demo_files/sago.jpg" id="target" alt="Flowers" />
147 
148       <div id="interface" style="margin: 1em 0;"></div>
149       <div><label><input type="checkbox" id="fadetog" /> Enable fading (bgFade: true)</label></div>
150       <div><label><input type="checkbox" id="shadetog" /> Use experimental shader (shade: true)</label></div>
151 
152       <p id="shadetxt" style="display:none; color:#900;">
153         <b>Experimental shader active.</b>
154         Jcrop now includes a shading mode that facilitates building
155         better transparent Jcrop instances. The experimental shader is less
156         robust than Jcrop's default shading method and should only be
157         used if you require this functionality. 
158       </p>
159 
160       <p>
161         <b>Animation/Transitions.</b>
162         Demonstration of animateTo API method and transitions for bgColor
163         and bgOpacity options. Color fading requires inclusion of John Resig's
164         jQuery <a href="http://plugins.jquery.com/project/color">Color 
165         Animations</a> plugin. If it is not included, colors will not fade.
166       </p>
167 
168     <div id="dl_links">
169       <a href="http://deepliquid.com/content/Jcrop.html">Jcrop Home</a> |
170       <a href="http://deepliquid.com/content/Jcrop_Manual.html">Manual (Docs)</a>
171     </div>
172 
173     </div>
174     </div>
175     </div>
176   </body>
177 </html>

/Jcrop/WebContent/tapmodo-Jcrop/demos/tutorial5.html

  1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  2   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  3 <html xmlns="http://www.w3.org/1999/xhtml">
  4   <head>
  5     <meta http-equiv="Content-type" content="text/html;charset=UTF-8" /> 
  6     <title>Jcrop &raquo; Tutorials &raquo; API Demo</title>
  7     <script src="../js/jquery.min.js" type="text/javascript"></script>
  8     <script src="../js/jquery.Jcrop.js" type="text/javascript"></script>
  9     <link rel="stylesheet" href="../css/jquery.Jcrop.css" type="text/css" />
 10     <link rel="stylesheet" href="demo_files/demos.css" type="text/css" />
 11     <style type="text/css">
 12       .optdual { position: relative; }
 13       .optdual .offset { position: absolute; left: 18em; }
 14       .optlist label { width: 16em; display: block; }
 15       #dl_links { margin-top: .5em; }
 16     </style>
 17     <script type="text/javascript">
 18 
 19       jQuery(function($){
 20 
 21         // The variable jcrop_api will hold a reference to the
 22         // Jcrop API once Jcrop is instantiated.
 23         var jcrop_api;
 24 
 25         // In this example, since Jcrop may be attached or detached
 26         // at the whim of the user, I've wrapped the call into a function
 27         initJcrop();
 28         
 29         // The function is pretty simple
 30         function initJcrop()//{{{
 31         {
 32           // Hide any interface elements that require Jcrop
 33           // (This is for the local user interface portion.)
 34           $('.requiresjcrop').hide();
 35 
 36           // Invoke Jcrop in typical fashion
 37           $('#target').Jcrop({
 38             onRelease: releaseCheck
 39           },function(){
 40 
 41             jcrop_api = this;
 42             jcrop_api.animateTo([100,100,400,300]);
 43 
 44             // Setup and dipslay the interface for "enabled"
 45             $('#can_click,#can_move,#can_size').attr('checked','checked');
 46             $('#ar_lock,#size_lock,#bg_swap').attr('checked',false);
 47             $('.requiresjcrop').show();
 48 
 49           });
 50 
 51         };
 52         //}}}
 53 
 54         // Use the API to find cropping dimensions
 55         // Then generate a random selection
 56         // This function is used by setSelect and animateTo buttons
 57         // Mainly for demonstration purposes
 58         function getRandom() {
 59           var dim = jcrop_api.getBounds();
 60           return [
 61             Math.round(Math.random() * dim[0]),
 62             Math.round(Math.random() * dim[1]),
 63             Math.round(Math.random() * dim[0]),
 64             Math.round(Math.random() * dim[1])
 65           ];
 66         };
 67 
 68         // This function is bound to the onRelease handler...
 69         // In certain circumstances (such as if you set minSize
 70         // and aspectRatio together), you can inadvertently lose
 71         // the selection. This callback re-enables creating selections
 72         // in such a case. Although the need to do this is based on a
 73         // buggy behavior, it's recommended that you in some way trap
 74         // the onRelease callback if you use allowSelect: false
 75         function releaseCheck()
 76         {
 77           jcrop_api.setOptions({ allowSelect: true });
 78           $('#can_click').attr('checked',false);
 79         };
 80 
 81         // Attach interface buttons
 82         // This may appear to be a lot of code but it's simple stuff
 83         $('#setSelect').click(function(e) {
 84           // Sets a random selection
 85           jcrop_api.setSelect(getRandom());
 86         });
 87         $('#animateTo').click(function(e) {
 88           // Animates to a random selection
 89           jcrop_api.animateTo(getRandom());
 90         });
 91         $('#release').click(function(e) {
 92           // Release method clears the selection
 93           jcrop_api.release();
 94         });
 95         $('#disable').click(function(e) {
 96           // Disable Jcrop instance
 97           jcrop_api.disable();
 98           // Update the interface to reflect disabled state
 99           $('#enable').show();
100           $('.requiresjcrop').hide();
101         });
102         $('#enable').click(function(e) {
103           // Re-enable Jcrop instance
104           jcrop_api.enable();
105           // Update the interface to reflect enabled state
106           $('#enable').hide();
107           $('.requiresjcrop').show();
108         });
109         $('#rehook').click(function(e) {
110           // This button is visible when Jcrop has been destroyed
111           // It performs the re-attachment and updates the UI
112           $('#rehook,#enable').hide();
113           initJcrop();
114           $('#unhook,.requiresjcrop').show();
115           return false;
116         });
117         $('#unhook').click(function(e) {
118           // Destroy Jcrop widget, restore original state
119           jcrop_api.destroy();
120           // Update the interface to reflect un-attached state
121           $('#unhook,#enable,.requiresjcrop').hide();
122           $('#rehook').show();
123           return false;
124         });
125 
126         // Hook up the three image-swapping buttons
127         $('#img1').click(function(e) {
128           jcrop_api.setImage('demo_files/sago.jpg');
129           jcrop_api.setOptions({ bgOpacity: .6 });
130           return false;
131         });
132         $('#img2').click(function(e) {
133           jcrop_api.setImage('demo_files/pool.jpg');
134           jcrop_api.setOptions({ bgOpacity: .6 });
135           return false;
136         });
137         $('#img3').click(function(e) {
138           jcrop_api.setImage('demo_files/sago.jpg',function(){
139             this.setOptions({
140               bgOpacity: 1,
141               outerImage: 'demo_files/sagomod.jpg'
142             });
143             this.animateTo(getRandom());
144           });
145           return false;
146         });
147 
148         // The checkboxes simply set options based on it's checked value
149         // Options are changed by passing a new options object
150 
151         // Also, to prevent strange behavior, they are initially checked
152         // This matches the default initial state of Jcrop
153 
154         $('#can_click').change(function(e) {
155           jcrop_api.setOptions({ allowSelect: !!this.checked });
156           jcrop_api.focus();
157         });
158         $('#can_move').change(function(e) {
159           jcrop_api.setOptions({ allowMove: !!this.checked });
160           jcrop_api.focus();
161         });
162         $('#can_size').change(function(e) {
163           jcrop_api.setOptions({ allowResize: !!this.checked });
164           jcrop_api.focus();
165         });
166         $('#ar_lock').change(function(e) {
167           jcrop_api.setOptions(this.checked?
168             { aspectRatio: 4/3 }: { aspectRatio: 0 });
169           jcrop_api.focus();
170         });
171         $('#size_lock').change(function(e) {
172           jcrop_api.setOptions(this.checked? {
173             minSize: [ 80, 80 ],
174             maxSize: [ 350, 350 ]
175           }: {
176             minSize: [ 0, 0 ],
177             maxSize: [ 0, 0 ]
178           });
179           jcrop_api.focus();
180         });
181 
182       });
183 
184     </script>
185 
186   </head>
187 
188   <body>
189     <div id="outer">
190     <div class="jcExample">
191     <div class="article">
192 
193       <h1>Jcrop - API Demo</h1>
194       <img src="demo_files/sago.jpg" id="target" alt="Jcrop Image" />
195 
196       <div style="margin: .8em 0 .5em;">
197         <span class="requiresjcrop">
198           <button id="setSelect">setSelect</button>
199           <button id="animateTo">animateTo</button>
200           <button id="release">Release</button>
201           <button id="disable">Disable</button>
202         </span>
203         <button id="enable" style="display:none;">Re-Enable</button>
204         <button id="unhook">Destroy!</button>
205         <button id="rehook" style="display:none;">Attach Jcrop</button>
206       </div>
207 
208       <fieldset class="optdual requiresjcrop">
209         <legend>Option Toggles</legend>
210         <div class="optlist offset">
211           <label><input type="checkbox" id="ar_lock" />Aspect ratio</label>
212           <label><input type="checkbox" id="size_lock" />minSize/maxSize setting</label>
213         </div>
214         <div class="optlist">
215           <label><input type="checkbox" id="can_click" />Allow new selections</label>
216           <label><input type="checkbox" id="can_move" />Selection can be moved</label>
217           <label><input type="checkbox" id="can_size" />Resizable selection</label>
218         </div>
219       </fieldset>
220 
221       <fieldset class="requiresjcrop" style="margin: .5em 0;">
222         <legend>Change Image</legend>
223         <span>
224           <button id="img2">Pool</button>
225           <button id="img1">Sago</button>
226           <button id="img3">Sago w/ outerImage</button>
227         </span>
228       </fieldset>
229 
230     <div id="dl_links">
231       <a href="http://deepliquid.com/content/Jcrop.html">Jcrop Home</a> |
232       <a href="http://deepliquid.com/content/Jcrop_Manual.html">Manual (Docs)</a>
233     </div>
234 
235     </div>
236     </div>
237     </div>
238   </body>
239 </html>

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原文地址：https://www.cnblogs.com/hongten/p/hongten_java_jcrop.html