需求,根据产品ID查询产品详情,产品详情会返回产品的一些文案,以及图片的url。需要做成,将文案信息记录在一个txt文档中,然后图片下载到文件夹,最后下载到本地,下载后自动删除刚才生成的文件夹以及文件夹生成的压缩包等。
例如压缩包打开是这样的:
txt文档是这样的:
需求已明了,现在开始从页面点击下载开始action层:
由于我是每次用户点击页面下载时,生成文件到一个压缩包,压缩包存在项目的路径下的,下载成功后删除文件以及压缩包。
/** * 获取当前产品的文案 * * @return * @throws IOException */ public Resolution getZip() throws IOException { HttpServletResponse response = getContext().getResponse(); Integer i = Integer.valueOf(gysupplierproducts.getProd_code());// JSONArray recal = getDealInfo.getDealInfoForOne(i);//得到产品信息json串 String url = ""; String name = ""; String fileDir = ""; for (int n = 0; n < recal.size(); n++) { Map<String, Object> returnMap = gysupplierproductsService.saveZip(recal.get(n).toString());//解析json串 url = returnMap.get("url").toString(); name = returnMap.get("name").toString(); fileDir = url; try { url = url+".zip"; try { File file = new File(url); File file2 = new File(fileDir); name = name+".zip"; response.setCharacterEncoding("UTF-8"); response.setHeader("Content-Disposition", "attachment; filename=" + new String(name.getBytes("ISO8859-1"), "UTF-8")); response.setContentLength((int) file.length()); response.setContentType("application/zip");// 定义输出类型 FileInputStream fis = new FileInputStream(file); BufferedInputStream buff = new BufferedInputStream(fis); byte[] b = new byte[1024];// 相当于我们的缓存 long k = 0;// 该值用于计算当前实际下载了多少字节 OutputStream myout = response.getOutputStream();// 从response对象中得到输出流,准备下载 // 开始循环下载 while (k < file.length()) { int j = buff.read(b, 0, 1024); k += j; myout.write(b, 0, j); } myout.flush(); buff.close(); file.delete();//删除生成的压缩包文件 ZipUtils.delAllFile(fileDir);//文件夹下面还有东西,需要全部删除。 file2.delete(); //删除生产的文件 } catch (Exception e) { System.out.println(e); } } catch (Exception e) { e.printStackTrace(); } } return null; }
service层,解析JSONArry,记录文本信息到txt,下载图片到指定文件夹下。
省略一解析部分:
public Map<String,Object> saveZip(String delStr) throws IOException{ Map<String,Object> returnMap = new HashMap<String, Object>(); returnMap.put("url", ""); returnMap.put("name", ""); JSONObject dealInfo = JSONObject.fromObject(delStr); File directory = new File("");// 参数为空 String courseFile = directory.getCanonicalPath(); //I:workspaceqhzn-fxxt String fileName = Comb.getComb().replaceAll("-",""); courseFile = courseFile+"\webapp\zip\"+fileName; //I:workspaceqhzn-fxxt/webapp/zip/425a0c0490704706813593d080329037 System.out.println(courseFile); File dirFile = new File(courseFile); dirFile.mkdir();//创建文件夹 DealBaseInfo baseInfo = (DealBaseInfo)JSONObject.toBean(dealInfo.getJSONObject("baseInfo"), DealBaseInfo.class) ; String title = baseInfo.getTitle();//产品名称 JSONArray inageArray = JSONArray.fromObject(baseInfoObj.get("imgInfos")); List<ImageInfo> inageList = JSONArray.toList(inageArray, new ImageInfo(), new JsonConfig()); // List<ImageInfo> inageList = baseInfo.getImgInfos(); for (int i = 0; i < inageList.size(); i++) { Integer frontImage =inageList.get(i).getFrontImage(); String imgName = ""; if(1==frontImage){ //首图 imgName = "首图"+i; this.downloadPicture(inageList.get(i).getImageUrl(), courseFile,imgName); }else{ // imgName = "内容图"+i; this.downloadPicture(inageList.get(i).getImageUrl(), courseFile,imgName); } } StringBuffer buffer = new StringBuffer(); buffer.append("产品名:"+title+" "); buffer.append("可用星期可用天数 :"+this.strToWeek(validWeekRule)+" "); //将解析的文字记录到txt FileMT.saveFile(fileName, buffer.toString(),courseFile); //压缩文件 courseFile FileOutputStream fos1 = new FileOutputStream(new File(courseFile+".zip")); ZipUtils.toZip(courseFile, fos1, false); returnMap.put("url", courseFile);//返回生成的文件夹名称和路径 returnMap.put("name", fileName); return returnMap; }
用到的公共方法:在解析周的时候,做了特殊处理,因为产品信息返回的周例如:"1101000"表示周一周二和周四可用,所以我们给用户展现需要转换过来。
一下是用到了方法:1101000转换星期
public static String strToWeek(String str){ String week=""; String[] weekArr={"星期一","星期二","星期三","星期四","星期五","星期六","星期日"}; for(int i=0;i<str.length();i++){ String curStr=str.substring(i, i+1); if("1".equals(curStr)){ week+=weekArr[i]+","; } } if(StringUtils.isNotBlank(week)){ week=week.substring(0,week.length()-1); } return week; }
下载网络图片:
/*** *urlList == 网络路径;path===下载存放的位置;imgName==图片名称 **/ private static void downloadPicture(String urlList,String path,String imgName) { URL url = null; try { url = new URL(urlList); DataInputStream dataInputStream = new DataInputStream(url.openStream()); FileOutputStream fileOutputStream = new FileOutputStream(new File(path+"\"+imgName+".jpg")); ByteArrayOutputStream output = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int length; while ((length = dataInputStream.read(buffer)) > 0) { output.write(buffer, 0, length); } fileOutputStream.write(output.toByteArray()); dataInputStream.close(); fileOutputStream.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }
FileMT类,保存成txt文本。
public static String saveFile(String fileName,String content,String url){ String result=""; try { contentToTxt(url+"/"+fileName+".txt", content); result="1"; } catch (Exception e) { result="2"; e.printStackTrace(); } return result; } public static void contentToTxt(String filePath, String content) { String str = new String(); String s1 = new String(); try { File f = new File(filePath); File parent = f.getParentFile(); if(parent!=null&&!parent.exists()){ parent.mkdirs(); } f.createNewFile(); if (f.exists()) { System.out.print("文件存在"); } else { System.out.print("文件不存在"); f.createNewFile(); } BufferedReader input = new BufferedReader(new FileReader(f)); while ((str = input.readLine()) != null) { s1 +=""; } input.close(); content= new String(content.getBytes("UTF-8"),"UTF-8"); s1 += content; BufferedWriter output = new BufferedWriter(new FileWriterWithEncoding(f, "utf-8")); output.write(s1); output.close(); } catch (Exception e) { e.printStackTrace(); } }
ZipUtils类,主要是压缩文件和删除文件夹工具类:
import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import com.tmwsoft.util.EncryptPassword; public class ZipUtils { private static final int BUFFER_SIZE = 2 * 1024; /** * 压缩成ZIP 方法1 * * @param srcDir * 压缩文件夹路径 * @param out * 压缩文件输出流 * @param KeepDirStructure * 是否保留原来的目录结构,true:保留目录结构; * false:所有文件跑到压缩包根目录下(注意:不保留目录结构可能会出现同名文件,会压缩失败) * @throws RuntimeException * 压缩失败会抛出运行时异常 */ public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure) throws RuntimeException { long start = System.currentTimeMillis(); ZipOutputStream zos = null; try { zos = new ZipOutputStream(out); File sourceFile = new File(srcDir); compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure); long end = System.currentTimeMillis(); System.out.println("压缩完成,耗时:" + (end - start) + " ms"); } catch (Exception e) { throw new RuntimeException("zip error from ZipUtils", e); } finally { if (zos != null) { try { zos.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 递归压缩方法 * * @param sourceFile * 源文件 * @param zos * zip输出流 * @param name * 压缩后的名称 * @param KeepDirStructure * 是否保留原来的目录结构,true:保留目录结构; * false:所有文件跑到压缩包根目录下(注意:不保留目录结构可能会出现同名文件,会压缩失败) * @throws Exception */ private static void compress(File sourceFile, ZipOutputStream zos, String name, boolean KeepDirStructure) throws Exception { byte[] buf = new byte[BUFFER_SIZE]; if (sourceFile.isFile()) { // 向zip输出流中添加一个zip实体,构造器中name为zip实体的文件的名字 zos.putNextEntry(new ZipEntry(name)); // copy文件到zip输出流中 int len; FileInputStream in = new FileInputStream(sourceFile); while ((len = in.read(buf)) != -1) { zos.write(buf, 0, len); } // Complete the entry zos.closeEntry(); in.close(); } else { File[] listFiles = sourceFile.listFiles(); if (listFiles == null || listFiles.length == 0) { // 需要保留原来的文件结构时,需要对空文件夹进行处理 if (KeepDirStructure) { // 空文件夹的处理 zos.putNextEntry(new ZipEntry(name + "/")); // 没有文件,不需要文件的copy zos.closeEntry(); } } else { for (File file : listFiles) { // 判断是否需要保留原来的文件结构 if (KeepDirStructure) { // 注意:file.getName()前面需要带上父文件夹的名字加一斜杠, // 不然最后压缩包中就不能保留原来的文件结构,即:所有文件都跑到压缩包根目录下了 compress(file, zos, name + "/" + file.getName(), KeepDirStructure); } else { compress(file, zos, file.getName(), KeepDirStructure); } } } } } public static boolean delAllFile(String path) { boolean flag = false; File file = new File(path); if (!file.exists()) { return flag; } if (!file.isDirectory()) { return flag; } String[] tempList = file.list(); File temp = null; for (int i = 0; i < tempList.length; i++) { if (path.endsWith(File.separator)) { temp = new File(path + tempList[i]); } else { temp = new File(path + File.separator + tempList[i]); } if (temp.isFile()) { temp.delete(); } if (temp.isDirectory()) { delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件 delFolder(path + "/" + tempList[i]);// 再删除空文件夹 flag = true; } } return flag; } public static void delFolder(String folderPath) { try { delAllFile(folderPath); // 删除完里面所有内容 String filePath = folderPath; filePath = filePath.toString(); java.io.File myFilePath = new java.io.File(filePath); myFilePath.delete(); // 删除空文件夹 } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) throws FileNotFoundException { /** 测试压缩方法1 */ FileOutputStream fos1 = new FileOutputStream(new File("f:/新建文本文档.zip")); ZipUtils.toZip("f:/新建文本文档.txt", fos1, true); } }
最后来个声明,以上所有资料都是我在网上找的别人的文章,然后复制代码变成我的了,已经找不到具体哪一篇。