这段时间做上海公共地理信息服务平台的时候，卡在了webservice在C#中的调用上，因为我们的服务发布要进行控制，所以就做了个代理，在代理里分析了当前服务的权限后再经过后台请求转发原服务地址，代码如下：
public Document loadByUrlAndDoc(HttpServletRequest req,String url,Document doc) {
??Document resultDoc = null;
??SAXReader saxReader = new SAXReader();
??HttpURLConnection connection = null;
??InputStream cin = null;
??OutputStream out = null;
??XMLWriter writer = null;
??try {
???URL httpURL = new URL(url);
???connection = (HttpURLConnection) httpURL.openConnection();
???connection.setDoInput(true);
???connection.setDoOutput(true);
???
???if(doc != null){
????connection.setRequestMethod("POST");
????connection.setRequestProperty("SOAPAction",
????"http://www.example.org/TopoAnalyse/DownStream");
???}
???else{
????connection.setRequestMethod("GET");
???}
???
???connection.setRequestProperty("","");
???connection.setConnectTimeout(30000);
???connection.setReadTimeout(30000);
???
//此处将表头中的所有属性都加载到转发请求中了
???for(Enumeration enum1 = req.getHeaderNames(); enum1.hasMoreElements(); ){
????String header = (String)enum1.nextElement();
????String value = req.getHeader(header);
????connection.setRequestProperty(header,value);
????log.info("header:"+header+" value:"+value);
???}
???
???if(doc != null){
????
????out = connection.getOutputStream();
????OutputFormat format = OutputFormat.createCompactFormat();
????format.setEncoding("UTF-8");
????writer = new XMLWriter(out,format);
????writer.write(doc);
????writer.flush();
????
???}
???
???cin = connection.getInputStream();
???BufferedInputStream bci = new BufferedInputStream(cin);
???resultDoc = saxReader.read(bci);
??} catch (Exception e) {
???log.info(e);
??} finally {
???if (out != null) {
????try {
?????out.close();
????} catch (IOException e) {
?????log.info(e);
????}
???}
???if (writer != null) {
????try {
?????writer.close();
????} catch (IOException e) {
?????log.info(e);
????}
???}
???if (cin != null) {
????try {
?????cin.close();
????} catch (IOException e) {
?????log.info(e);
????}
???}
???
???if(connection != null) {
????connection.disconnect();
???}
??}
??return resultDoc;
?}
?
之后再WebLogic中报以下错误（在tomcat中没问题）
Did not meet stated content length of OutputStream:? you wrote 0 bytes and I was expecting? you to write exactly 187 bytes!!!
分析了很久最后发现是在装载表头的时候把ContentLength也设置进去了
最后将contentlength从表头中去除就OK乐
去掉表头中contentlength的方法如下：
for(Enumeration enum1 = req.getHeaderNames(); enum1.hasMoreElements(); ){
????String header = (String)enum1.nextElement();
????String value = req.getHeader(header);
?? if(header?！="content-length")
????connection.setRequestProperty(header,value);
????log.info("header:"+header+" value:"+value);
???}
?
还有一种方法，如下：
请检查web应用中的servlet代码查看是否设置了长度。也可以做下面的修改来解决这个问题：
response.setContentLength(0);
……
……
response.flushBuffer();
return;
