Java HttpClient Post JSON

1、Java模拟POST表单操作 HttpClient的应用及注意事项

http://blog.csdn.net/DL88250/article/details/1699678

package post;

import java.io.IOException;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;

public class PostHttp {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  HttpClient httpClient = new HttpClient();
  String url = "http://193.167.13.21/setup.cgi";
  PostMethod postMethod = new PostMethod(url);
//   填入各个表单域的值
  NameValuePair[] data = { 
    new NameValuePair("ID", "11"),
    new NameValuePair("mtg", "0"),
    new NameValuePair("haveCookie", "0"),
    new NameValuePair("backID", "30"),
    new NameValuePair("psw", "password")
  };
//   将表单的值放入postMethod中
  postMethod.setRequestBody(data);
//   执行postMethod
  int statusCode = 0;
  try {
   statusCode = httpClient.executeMethod(postMethod);
  } catch (HttpException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
//   HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发
//   301或者302
  if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY)
  {
   //   从头中取出转向的地址
   Header locationHeader = postMethod.getResponseHeader("location");
   String location = null;
   if (locationHeader != null) {
    location = locationHeader.getValue();
    System.out.println("The page was redirected to:" + location);
   }
   else {
    System.err.println("Location field value is null.");
   }
   return;
  }
  else
  {
         System.out.println(postMethod.getStatusLine());
         String str = "";
         try {
               str = postMethod.getResponseBodyAsString();
         } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
         }         
         System.out.println(str);
  }
  postMethod.releaseConnection();
        return ;
 }

}
//这是一个用户认证过程的登陆信息

其中需要的jar包：

1、 commons-httpclient-3.1-rc1.zip http://jakarta.apache.org/commons/httpclient/downloads.html

2、commons-codec-1.3.jar    http://jakarta.apache.org/site/downloads/downloads_commons-codec.cgi

3、commons-logging-api.jar   在tomcat5.5中的Tomcat 5.5/bin目录下或者    http://jakarta.apache.org/site/downloads/downloads_commons-logging.cgi

2、java应用程序获取ArcGIS REST服务

http://www.cnblogs.com/computer-lzy/archive/2011/03/15/1984962.html

 

package com.javaeedev;

import java.util.HashMap;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.JsonToken;
import org.codehaus.jackson.map.MappingJsonFactory;

public class json4 {
     private static String URL = "http://m.weather.com.cn/data/101070201.html";// 请求的地址，一个返回JSON格式数据地址
     private static HttpClient client;  
     private static GetMethod getMethod;  
     /** 
      * 静态块初始化所需对象 
      */  
     static {  
         client = new HttpClient(); 
         //设置代理，如果没有使用代理，略去该句
         client.getHostConfiguration().setProxy("10.60.30.90", 3128);
         getMethod = new GetMethod(URL);  
     }  
     /** 
      * 获取获得的Json结果 
      *  
      * @return 
      */  
     public static String getJsonText() {  
         System.out.println("json2");
         String jsonText = null;  
         try {  
             System.out.println("1"+jsonText);
             int status = client.executeMethod(getMethod);  

             System.out.println(status);
             if (status == HttpStatus.SC_OK) {// HTTP 200 OK  
                 jsonText = getMethod.getResponseBodyAsString();// 获取字符串形式的结果，建议使用流式结果  
             }  
         } catch (Exception e) {  

             System.out.println("2"+jsonText);
             System.err.println(e);  
         }  
         System.out.println("3"+jsonText);
         return jsonText;  
     }  
     /** 
      * 处理Json结果并封装Bean 
      *  
      * @param jsonText 
      * @return 
      */ 
     public static Weather getWeatherBean(String jsonText) {  
         System.out.println("json3");
         // Weather对象  
         Weather weather = new Weather();  
         System.out.println(jsonText);
         try {  
             JsonFactory jsonFactory = new MappingJsonFactory();  
            // Json解析器  
             JsonParser jsonParser = jsonFactory.createJsonParser(jsonText);  
             // 跳到结果集的开始  
             jsonParser.nextToken();  
             // 接受结果的HashMap  
             HashMap<String, String> map = new HashMap<String, String>();  
             // while循环遍历Json结果  
             while (jsonParser.nextToken() != JsonToken.END_OBJECT) {  
                 // 跳转到Value  
                 jsonParser.nextToken();  
                 // 将Json中的值装入Map中  
                 map.put(jsonParser.getCurrentName(), jsonParser.getText());  
             }  
             // 将数据封装  
             weather.setCity(map.get("city"));  
             weather.setDate(map.get("date_y"));  
             weather.setLunarDate(map.get("date"));  
             weather.setWeek(map.get("week"));  
             weather.setFcTime(map.get("fchh"));  
             weather.setTemperature(map.get("temp1"));  
             weather.setWeather(map.get("weather1"));  
             weather.setWind(map.get("wind1"));  
         } catch (Exception e) {  
             System.err.println(e);  
         }  
         return weather;  
     }  
     
   
    
     
     /** 
      * 主函数 
      *  
      * @param args 
      */  
     public static void main(String[] args) {  
         System.out.println("json1");
         System.out.println(getWeatherBean(getJsonText()));  
     }  
}
 注意：一般情况下，需要你在项目中引用几个jar包的：
jackson-core-asl-1.4.0.jar，
jackson-mapper-asl-1.4.0.jar， 
json.jar
json-lib-2.4-jdk15.jar

 

3、使用httpclient的PostMethod.setRequestBody()方法，发送一个xml字符串或流文件

 

使用httpclient的PostMethod.setRequestBody()方法，发送一个xml字符串或流文件
如下： 
HttpClient httpClient = new HttpClient(); 
PostMethod postMethod = new PostMethod(this._url); 
postMethod.setRequestBody("<?xml version=\"1.0\" encoding=\"UTF-8\"><root><flag>1</flag></root>"); 
或者 
postMethod.setRequestBody(new FileInputStream(new File(""))); 

4、java中返回的JSON对象转换成List用法

 

//调用URL --分页
　　String str = CommonConstant.getPhotoAlbumByUserIdURL() + userid + "&pageNo="
　　+ paginationDto.getPageNum() + "&pageSize=" + paginationDto.getRowsPerPage();
　　HttpClient client = new HttpClient();
　　PostMethod method = new PostMethod(str);
　　List photoAlbumList = new ArrayList();
　　try {
　　client.executeMethod(method);
　　} catch (HttpException e) {
　　e.printStackTrace();
　　} catch (IOException e) {
　　e.printStackTrace();
　　}
　　String returnJson = "";
　　try {
　　returnJson = method.getResponseBodyAsString();//返回json字符串值
　　System.out.println("---------------------returnJson---------------------------------" + returnJson);
　　if(returnJson != null && returnJson != ""){
　　String strJson = returnJson.replace("?(", "").replace(")", "").replace(";", "");
　　if(strJson.startsWith("{")){
　　JSONObject jsonObject = JSONObject.fromObject(strJson);
　　String code = jsonObject.getString("code").toString();
　　if("200".equals(code)){
　　JSONArray jsonArray = JSONArray.fromObject(jsonObject.get("result"));
　　JSONObject jsonObj = jsonArray.getJSONObject(0);
　　JSONArray dataArray = JSONArray.fromObject(jsonObj.get("data"));
　　for (int i = 0, len = dataArray.size(); i < len; i++) {
　　PhotoAlbumVO vo = new PhotoAlbumVO();
　　JSONObject jsonVideo = dataArray.getJSONObject(i);
　　vo.setId(jsonVideo.get("id").toString());
　　vo.setUserid(jsonVideo.get("userid").toString());
　　vo.setTitle(jsonVideo.get("title").toString());
　　vo.setIntro(jsonVideo.get("intro").toString());
　　vo.setCoverPath(jsonVideo.get("cover_path").toString());
　　vo.setType(Integer.parseInt(jsonVideo.get("type").toString()));
　　vo.setNumberPhoto(Integer.parseInt(jsonVideo.get("number_photo").toString()));
　　vo.setCreatedTime(DateTimeUtils.parseFullDateTime(DateUtil.getDateTimeByMillisecond(jsonVideo.get("created_time").toString())));
　　vo.setUpdatedTime(DateTimeUtils.parseFullDateTime(DateUtil.getDateTimeByMillisecond(jsonVideo.get("updated_time").toString())));
　　photoAlbumList.add(vo);
　　}
　　JSONArray pageArray = JSONArray.fromObject(jsonObj.get("page"));
　　JSONObject pagerObj = pageArray.getJSONObject(0);
　　JSONArray pagerArray = JSONArray.fromObject(pagerObj.get("pager"));
　　JSONObject pagerObj1 = pagerArray.getJSONObject(0);
　　paginationDto.setTotalRowNum(Long.valueOf(pagerObj1.get("pageSum").toString()));
　　}
　　}
　　}
　　} catch (IOException e1) {
　　e1.printStackTrace();
　　}finally{
　　//使用完成后要释放链接
　　method.releaseConnection();
　　}
　　System.out.println("===========================================size"+photoAlbumList.size());
　　return photoAlbumList;

 

 5、