httpClient java.net.URLEncoder.encode二次转码问题

来源：互联网发布：大学生网络创业风险编辑：程序博客网时间：2024/06/05 16:12

原文地址：http://blog.csdn.net/zelda002/article/details/8563222

我在servlet中调用java.net.URLDecoder.decode(request.getParameter("name"), "UTF-8")方法和调用java.net.URLDecoder.decode(request.getQueryString(), "UTF-8")所得到的结果是不一样的，就是由于在request.getParameter("name")之前会自动做一次解码的工作，而且是默认的ISO-8859-1。

所以，在使用java.net.URLEncoder.decode()和java.net.URLDecoder.decode(),的时候需要在前端页面中使用两次java.net.URLDecoder.decode()方法。

使用两次编码的过程相当于如下代码：
            String name=java.net.URLEncoder.encode("测试", "UTF-8");
            System.out.println(name);
            name=java.net.URLEncoder.encode(name,"UTF-8");
            System.out.println(name);
            name=java.net.URLDecoder.decode(name, "UTF-8");
            System.out.println(name);
            System.out.println(java.net.URLDecoder.decode(name, "UTF-8"));

输出为：

            %E6%B5%8B%E8%AF%95
            %25E6%25B5%258B%25E8%25AF%2595
            %E6%B5%8B%E8%AF%95
            测试

第一次编码后将汉字编码为%和字母数字的格式，而第二次编码的时候是对%字母数字进行编码，虽然解码的时候使用的是ISO-8859-1，但是对于%和字母数字而言用ISO-8859-1和UTF-8解码出来的是一样的，此时就回到了汉字被编码过一次的字符串了，当再次进行解码的时候使用UTF-8就回将它转会汉字；

具体实现：

new Thread(new Runnable() {
@Override
public void run() {

                                  httpClient会二次把%转码
                                    /*HttpMethod httpMethod = new GetMethod();
                                   String httpurl = Key.LOGGER_URL + "?category=server&permanent=" + cookies + "&user_hash=" + tempUid
                                           + "&product=wap" + "&version=1.2&view=register&action=" + promptEn + "&channel=" + sid
                                           + "&source=&referer=" + referer1
                                           + "&user_agent=" + java.net.URLEncoder.encode(request1.getHeader("user-agent"))
                                           + "&created=" + System.currentTimeMillis()
                                           + "&client_ip=&url=" + url1;
                                    try {
                                       HttpClient httpClient = new HttpClient();
                                       httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(60000);
                                       httpMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 30000);
                                       httpMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");
                                       httpMethod.getParams().setParameter("user-agent", "wap.zch168.com");
//                                       System.out.println("httpurl:::" + httpurl);
                                        httpMethod.setURI(new URI(httpurl, false, "utf-8"));
                                        httpClient.executeMethod(httpMethod);
                                    } catch (Exception e) {
                                        e.printStackTrace();
                                    }
                                    httpMethod.releaseConnection();*/

                                   //后改用：
                                   SafelotteryHttp http = new SafelotteryHttp();
                                   try{
                                       String httpurl = Key.LOGGER_URL + "?category=server&permanent=" + cookies + "&user_hash=" + tempUid
                                               + "&product=wap" + "&version=1.2&view=register&action=" + promptEn + "&channel=" + sid
                                               + "&source=&referer=" + referer1
                                               + "&user_agent=" + user_agent
                                               + "&created=" + System.currentTimeMillis()
                                               + "&client_ip=&url=" + url1;
                                       http.doGet(httpurl, null, "UTF-8", true);
                                   }catch(Exception e){
                                       e.printStackTrace();
                                   }
                               }
                           }).start();

public static String doGet(String url, String queryString, String charset, boolean pretty) {
        StringBuffer response = new StringBuffer();
        HttpClient client = new HttpClient();
        HttpMethod method = new GetMethod(url);
        try {
            if (StringUtils.isNotBlank(queryString))
                //对get请求参数做了http请求默认编码，好像没有任何问题，汉字编码后，就成为%式样的字符串
               method.setQueryString(URIUtil.encodeQuery(queryString));
            client.executeMethod(method);
            if (method.getStatusCode() == HttpStatus.SC_OK) {
                BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
                String line;
                while ((line = reader.readLine()) != null) {
                    if (pretty)
                       response.append(line).append(System.getProperty("line.separator"));
                    else
                       response.append(line);
                }
                reader.close();
            }
        } catch (URIException e) {
           logger.error("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e);
        } catch (IOException e) {
           logger.error("执行HTTP Get请求" + url + "时，发生异常！", e);
        } finally {
            method.releaseConnection();
        }
        return response.toString();
    }

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