Java dom4j解析RESTFull风格发布的WebService的xml文件

公司项目要求解析出RESTFull风格发布的WebService接口的所有请求方法，参数，参数类型，已经方法是返回类型，想来想去都不知道该怎么办，思来想去然后又研究RESTFull风格WebService的xml文件，发现其实对于Java简单类型的方法是能在xml文件中体现的，但是对于复杂类型，比如参数是一个对象，或者返回值是一个对象或者List，Map等。这些返回类型在xml文件中的 response下representation这个节点的属性type会是一个"application/json"。对于这些返回类型或者参数我没法知道是什么类型，所以我就默认给这些Object类型。对于void类型的方法，会在response的status属性等于204，所以我就笨笨的用HttpClient抓去整个xml文件，然后用dome4j解析这个xml，幸好的是我在项目只需要解析简单类型的方法，所以想想也能达到要求.

  1 package xxx.xxx.common;
  2  
  3  import java.util.List;
  4  
  5  import org.apache.commons.httpclient.HttpClient;
  6  import org.apache.commons.httpclient.HttpStatus;
  7  import org.apache.commons.httpclient.methods.GetMethod;
  8  import org.dom4j.Document;
  9  import org.dom4j.DocumentException;
 10  import org.dom4j.DocumentHelper;
 11  import org.dom4j.Element;
 12  
 13  import com.google.common.collect.Lists;
 14  import com.qya.vo.transform.TransformParamVO;
 15  import com.qya.vo.transform.TransformVO;
 16  
 17  import com.qya.utils.string.StringUtil;
 18  
 19  public class TransformWsUrlUtil {
 20  
 21      protected final String DEFAULT_URL = "http://localhost:8080/bpms/services?_wadl";
 22  
 23      public static List<TransformVO> transform(String url) {
 24          String xml = getTransformXml(url);
 25          Document doc = null;
 26          try {
 27              doc = DocumentHelper.parseText(xml);
 28          } catch (DocumentException e) {
 29              e.printStackTrace();
 30          }
 31          List<TransformVO> lst = Lists.newArrayList();
 32          String rootPath = "";
 33          Element resourcesEl = doc.getRootElement().element("resources");
 34          if (resourcesEl.hasContent()) {
 35              List<Element> els = resourcesEl.elements();
 36              for (Element resEl : els) {
 37                  rootPath = resEl.attribute(0).getText();
 38                  if (resEl.hasContent()) {
 39                      lst.addAll(getMethod(rootPath, resEl.elements()));
 40                  }
 41              }
 42          }
 43          return lst;
 44      }
 45  
 46      // 所有方法列表
 47      public static List<TransformVO> getMethod(String rootPath, List<Element> els) {
 48          List<TransformVO> lst = Lists.newArrayList();
 49          String wsPath = "";
 50          String returnType = "";
 51          for (Element el : els) {
 52              returnType = transform2JavaType(getReturnType(el));
 53              wsPath = el.attribute("path").getText();
 54              if(!"java.lang.Object".equals(returnType)){  //此处我做了判断，只需要简单类型和void类型的方法
 55                  TransformVO vo = new TransformVO();
 56                  vo.setUrl(transform2JavaType(rootPath + wsPath));
 57                  vo.setUrlMethodName(transform2JavaType(returnType + "   " + replaceSeparatorLine(wsPath) + getParamters(el)));
 58                  vo.setMethodName(transform2JavaType(wsPath));
 59                  vo.setReturnType(returnType);
 60                  List<TransformParamVO> paramLst = getParamterVO(el);
 61                  vo.setTransformParamLst(paramLst);
 62                  lst.add(vo);
 63              }
 64          }
 65          return lst;
 66      }
 67  
 68      /**
 69       * 获取方法的所有参数
 70       * 
 71       * @param el
 72       * @return 参数字符串
 73       */
 74      public static String getParamters(Element el) {
 75          StringBuffer buf = new StringBuffer("(");
 76          Element requestEl = el.element("method").element("request");
 77          if (!StringUtil.isNullOrEmpty(requestEl)) {
 78              if (requestEl.hasContent()) {
 79                  for (Element paramEl : (List<Element>) requestEl.elements()) {
 80                      if ("param".equals(paramEl.getName())) {
 81                          buf.append(paramEl.attributeValue("type") + "  " + paramEl.attributeValue("name") + ",   ");
 82                      }
 83                      if ("representation".equals(paramEl.getName())) {
 84                          if (paramEl.hasContent()) {
 85                              for (Element pEl : (List<Element>) paramEl.elements()) {
 86                                  buf.append(pEl.attributeValue("type") + "  " + pEl.attributeValue("name") + ",   ");
 87                              }
 88                          }
 89                      }
 90                  }
 91              }
 92          }
 93          buf.append(")");
 94          return buf.toString();
 95      }
 96  
 97      public static List<TransformParamVO> getParamterVO(Element el) {
 98          List<TransformParamVO> lst = Lists.newArrayList();
 99          Element requestEl = el.element("method").element("request");
100          if (!StringUtil.isNullOrEmpty(requestEl)) {
101              if (requestEl.hasContent()) {
102                  for (Element paramEl : (List<Element>) requestEl.elements()) {
103                      if ("param".equals(paramEl.getName())) {
104                          TransformParamVO vo = new TransformParamVO();
105                          vo.setName(paramEl.attributeValue("name"));
106                          vo.setType(transform2JavaType(paramEl.attributeValue("type")));
107                          lst.add(vo);
108                      }
109                      if ("representation".equals(paramEl.getName())) {
110                          if (paramEl.hasContent()) {
111                              for (Element pEl : (List<Element>) paramEl.elements()) {
112                                  TransformParamVO vo = new TransformParamVO();
113                                  vo.setName(pEl.attributeValue("name"));
114                                  vo.setType(transform2JavaType(pEl.attributeValue("type")));
115                                  lst.add(vo);
116                              }
117                          }
118                      }
119                  }
120              }
121          }
122          return lst;
123      }
124  
125      /*
126       * 获取返回类型
127       */
128      public static String getReturnType(Element el) {
129          String returnType = "";
130          List<Element> returnTypeEls = el.element("method").element("response").elements("representation");
131          if (!StringUtil.isNullOrEmpty(returnTypeEls)) {
132              if (returnTypeEls.isEmpty()) {
133                  if (!StringUtil.isNullOrEmpty(el.element("method").element("response").attribute("status"))) {
134                      if ("204".equals(el.element("method").element("response").attribute("status").getText())) {
135                          returnType = "void";
136                      }
137                  }
138              } else {
139                  for (Element returnTypeEl : returnTypeEls) {
140                      if (returnTypeEl.hasContent()) {
141                          for (Element pEl : (List<Element>) returnTypeEl.elements()) {
142                              returnType = pEl.attributeValue("type");
143                          }
144                      } else {
145                          returnType = "java.lang.Object";
146                      }
147                  }
148              }
149          }
150          return returnType;
151      }
152  
153      private static String transform2JavaType(String str) {
154          if (!StringUtil.isNullOrEmpty(str)) {
155              if (str.contains("xs:int")) {
156                  str = str.replaceAll("xs:int", "java.lang.Integer");
157              }
158              if (str.contains("xs:string")) {
159                  str = str.replaceAll("xs:string", "java.lang.String");
160              }
161              if (str.contains("xs:boolean")) {
162                  str = str.replaceAll("xs:boolean", "java.lang.Boolean");
163              }
164              if (str.contains("xs:double")) {
165                  str = str.replaceAll("xs:double", "java.lang.Double");
166              }
167              if (str.contains("xs:dateTime")) {
168                  str = str.replaceAll("xs:dateTime", "java.util.Date");
169              }
170              if (str.lastIndexOf(",") > 0) {
171                  str = str.substring(0, str.lastIndexOf(",")) + ")";
172              }
173          }
174          return str;
175      }
176      private static String replaceSeparatorLine(String str) {
177          if (!StringUtil.isNullOrEmpty(str)) {
178              if (str.contains("/")) {
179                  str = str.replaceAll("\\/", "");
180              }
181          }
182          return str;
183      }
184  
185      /**
186       * 后去需要转换的xml内容
187       * 
188       * @param url
189       *            访问的webservice url
190       * @return xml内容
191       */
192      private static String getTransformXml(String url) {
193          String xml = "";
194          HttpClient httpClient = new HttpClient();
195          GetMethod getMethod = new GetMethod(url);
196          try {
197              int statusCode = httpClient.executeMethod(getMethod);
198              if (statusCode != HttpStatus.SC_OK) {
199                  System.err.println("Method failed: " + getMethod.getStatusLine());
200              }
201              // 读取内容
202              byte[] responseBody = getMethod.getResponseBody();
203              // 处理内容
204              xml = new String(responseBody);
205          } catch (Exception e) {
206              System.err.println("页面无法访问");
207          } finally {
208              getMethod.releaseConnection();
209          }
210          return xml;
211      }
212  
213  }

TransformVO.java

 1 package com.qya.vo.transform;
 2  
 3  import java.io.Serializable;
 4  import java.util.List;
 5  
 6  import com.google.common.collect.Lists;
 7  
 8  public class TransformVO implements Serializable {
 9      
10      private static final long serialVersionUID = -8192032660217273046L;
11      private String url;
12      private String urlMethodName;
13      private String methodName;
14      private String returnType;
15      private List<TransformParamVO> transformParamLst = Lists.newArrayList();
16      public String getUrl() {
17          return url;
18      }
19      public void setUrl(String url) {
20          this.url = url;
21      }
22      public String getUrlMethodName() {
23          return urlMethodName;
24      }
25      public void setUrlMethodName(String urlMethodName) {
26          this.urlMethodName = urlMethodName;
27      }
28      public String getMethodName() {
29          return methodName;
30      }
31      public void setMethodName(String methodName) {
32          this.methodName = methodName;
33      }
34      public String getReturnType() {
35          return returnType;
36      }
37      public void setReturnType(String returnType) {
38          this.returnType = returnType;
39      }
40      public List<TransformParamVO> getTransformParamLst() {
41          return transformParamLst;
42      }
43      public void setTransformParamLst(List<TransformParamVO> transformParamLst) {
44          this.transformParamLst = transformParamLst;
45      }
46  }

TransformParamVO.java

 1 package com.qya.vo.transform;
 2  
 3  import java.io.Serializable;
 4  
 5  public class TransformParamVO implements Serializable {
 6  
 7      private static final long serialVersionUID = 2728404017781534263L;
 8      private String type;
 9      private String name;
10      public String getType() {
11          return type;
12      }
13      public void setType(String type) {
14          this.type = type;
15      }
16      public String getName() {
17          return name;
18      }
19      public void setName(String name) {
20          this.name = name;
21      }
22      
23  }

StringUtil.java

 1 package com.qya.utils.string.StringUtil
 2 
 3 public class StringUtil {
 4 
 5     /**
 6      * 判断是否为空后null
 7      * 
 8      * @param obj
 9      *            对象
10      * @return boolean
11      * @since 1.0
12      */
13     public static boolean isNullOrEmpty(Object obj) {
14         return obj == null || "".equals(obj.toString());
15     }
16 }

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原文地址：https://www.cnblogs.com/quanyongan/p/3027291.html