Java模拟Http post、get请求

墨蓝 2022-07-21 00:24 183阅读 0赞

/**
         * post
         * 2016-6-12 下午2:16:14  李锋镝
         * @param url POST地址
         * @param data POST数据NameValuePair[]
         * @return 响应的参数
         */
        public static String post(String url,NameValuePair[] data){
             
            String response = "";
             
            HttpClient httpClient = new HttpClient();
            PostMethod postMethod = new PostMethod(url);
             
            //设置请求编码
            postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"GBK");
             
            postMethod.setRequestBody(data);
             
            //设置请求头header参数
            postMethod.setRequestHeader("userId","57601095");
            postMethod.setRequestHeader("userSession","57601095");
            postMethod.setRequestHeader("cityid","31000");
             
            int statusCode = 0;
             
            try {
                statusCode = httpClient.executeMethod(postMethod);
            } catch (HttpException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
             
            //301、302重定向
            if(statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY){
                Header locationHeader = postMethod.getResponseHeader("location"); 
                String location = null; 
                if (locationHeader != null) { 
                    location = locationHeader.getValue(); 
                    System.out.println("重定向跳转页面:" + location); 
                    response= post(location,data);//用跳转后的页面重新请求。 
                } else { 
                    System.err.println("location is null."); 
                }
            }else { 
                System.out.println(postMethod.getStatusLine()); 
                try { 
                    byte[] b=postMethod.getResponseBody();
                    response = new String(b,"GBK");
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
                postMethod.releaseConnection(); 
            }
             
            System.out.println("POST响应参数："+response);
             
            return response;
        }
         
        /**
         * get方式
         * 2016-6-12 下午2:38:45  李锋镝
         * @param url
         * @return
         */
        public static String get(String url){
             
            String response = "";
             
            HttpClient httpClient = new HttpClient();
            GetMethod getMethod = new GetMethod(url);
             
            getMethod.setRequestHeader("userId","56166702");
            getMethod.setRequestHeader("userSession","56166702");
            getMethod.setRequestHeader("cityid","31000");
             
            int statusCode = 0;
             
            try {
                statusCode = httpClient.executeMethod(getMethod);
            } catch (HttpException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
             
            //301、302重定向
            if(statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY){
                Header locationHeader = getMethod.getResponseHeader("location"); 
                String location = null; 
                if (locationHeader != null) { 
                    location = locationHeader.getValue(); 
                    System.out.println("重定向跳转页面:" + location); 
                    response= get(location);//用跳转后的页面重新请求。 
                } else { 
                    System.err.println("location is null."); 
                }
            }else { 
                System.out.println(getMethod.getStatusLine()); 
                try { 
                    byte[] b=getMethod.getResponseBody();
                    response = new String(b,"GBK");
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
                getMethod.releaseConnection(); 
            }
             
            System.out.println("GET响应参数："+response);
             
            return response;
        }

对于post请求，我们需要根据对应接口的编码设置请求编码，防止中文乱码。请求需要的参数则放在NameValuePair数组中，NameValuePair用法如下：

NameValuePair page = new NameValuePair("page", "1");
    NameValuePair pageCount = new NameValuePair("pageCount", "10");
    NameValuePair state = new NameValuePair("state", "1");
    NameValuePair[] data = {page,pageCount,state};

而get请求，则不需要改变编码，默认的ISO-8859-1编码，一般后台会根据这个处理中文，请求的时候只需要写好请求的url即可。

原文地址:[李锋镝的个人博客][Link 1]>> [ http://www.lifengdi.com/article/10034.html][http_www.lifengdi.com_article_10034.html]

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