jquery-ajax请求action读取oracle数据库clob字段xml数据格式化显示（struts2）

1.页面js

function showXML(aa,bb){$.ajax({url : encodeURI("showXML.action?aa="+aa+"&bb="+bb),type : 'POST',dataType : "html",success : function(data) {document.getElementById('mainContent').innerText = data;}});}

2.action类

public String showXML() throws IOException, SQLException, SAXException, ParserConfigurationException, DocumentException{                    HttpServletRequest request=ServletActionContext.getRequest();          HttpServletResponse response=ServletActionContext.getResponse();          response.setContentType("text/xml;charset=utf-8"); //（1）一定要在（2）的前面，不然会乱码            response.setCharacterEncoding("UTF-8"); //（2）            response.setHeader("Cache-Control", "no-cache");             PrintWriter pw=response.getWriter();                      String aa=request.getParameter("aa");          String bb=request.getParameter("bb");                    JavBean javaBean=xmlService.showXML(aa, bb);                    Clob clob=javaBean.getClobXml();            //      String msgXML=clob.getSubString(1L,(int)clob.length());            //      InputStream input = clob.getAsciiStream();    //乱码  //        int len = (int)clob.length();  //        byte[] by = new byte[len];  //        int i ;  //        while(-1 != (i = input.read(by, 0, by.length))) {  //            input.read(by, 0, i);  //        }  //      String msgXML = new String(by);          //CLOB转String        Reader inStreamDoc = clob.getCharacterStream();             char[] tempDoc = new char[(int) clob.length()];             inStreamDoc.read(tempDoc);             inStreamDoc.close();                     String msgXML= new String(tempDoc);       //      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  //      Document doc = factory.newDocumentBuilder().parse(new ByteArrayInputStream(msgXML.getBytes()));              //格式化xml字符串        SAXReader reader = new SAXReader();          Document _document =  reader.read(new StringReader(msgXML));  //dom4j，not w3c        String paramXML = "";          OutputFormat format = OutputFormat.createPrettyPrint();          format.setEncoding("utf-8");                      ByteArrayOutputStream out = new ByteArrayOutputStream();           XMLWriter writer = new XMLWriter(out, format);           writer.write(_document);                  writer.toString();          writer.flush();          writer.close();                                  paramXML = out.toString(format.getEncoding()); //页面显示         StringBuilder sb=new StringBuilder();            sb.append(paramXML);                    pw.print(sb.toString());            pw.flush();            pw.close();           return "success";      }