httpclient模拟post请求json封装表单数据的实现方法

废话不说上代码：

public static string httppostwithjson(string url) throws exception {

    httppost httppost = new httppost(url);
    closeablehttpclient client = httpclients.createdefault();
    string respcontent = null;
    
//    json方式
    jsonobject jsonparam = new jsonobject(); 
    jsonparam.put("name", "admin");
    jsonparam.put("pass", "123456");
    stringentity entity = new stringentity(jsonparam.tostring(),"utf-8");//解决中文乱码问题  
    entity.setcontentencoding("utf-8");  
    entity.setcontenttype("application/json");  
    httppost.setentity(entity);
    system.out.println();
    
  
//    表单方式
//    list<basicnamevaluepair> pairlist = new arraylist<basicnamevaluepair>(); 
//    pairlist.add(new basicnamevaluepair("name", "admin"));
//    pairlist.add(new basicnamevaluepair("pass", "123456"));
//    httppost.setentity(new urlencodedformentity(pairlist, "utf-8"));  
    
    
    httpresponse resp = client.execute(httppost);
    if(resp.getstatusline().getstatuscode() == 200) {
      httpentity he = resp.getentity();
      respcontent = entityutils.tostring(he,"utf-8");
    }
    return respcontent;
  }

  
  public static void main(string[] args) throws exception {
    string result = httppostwithjson("http://localhost:8080/hctest2/hc");
    system.out.println(result);
  }

post方式 就要考虑提交的表单内容怎么传输了。本文name和pass就是表单的值了。

封装表单属性可以用json也可以用传统的表单，如果是传统表单的话 要注意，也就是在上边代码注释那部分。用这种方式的话在servlet里也就是数据处理层可以通过request.getparameter(”string“)直接获取到属性值。就是相比json这种要简单一点，不过在实际开发中一般都是用json做数据传输的。用json的话有两种选择一个是阿里巴巴的fastjson还有一个就是谷歌的gson。fastjson相比效率比较高，gson适合解析有规律的json数据。博主这里用的是fastjson。还有用json的话在数据处理层要用流来读取表单属性，这就是相比传统表单多的一点内容。代码下边已经有了。

public class hcservlet extends httpservlet {
  private static final long serialversionuid = 1l;
    
  protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
    dopost(request, response);
  }

  
  protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
    
    request.setcharacterencoding("utf-8"); 
    response.setcontenttype("text/html;charset=utf-8"); 
    string acceptjson = ""; 
    user user = new user();
    bufferedreader br = new bufferedreader(new inputstreamreader( 
        (servletinputstream) request.getinputstream(), "utf-8")); 
    stringbuffer sb = new stringbuffer(""); 
    string temp; 
    while ((temp = br.readline()) != null) { 
      sb.append(temp); 
    } 
    br.close(); 
    acceptjson = sb.tostring(); 
    if (acceptjson != "") { 
      jsonobject jo = jsonobject.parseobject(acceptjson);
      user.setusername(jo.getstring("name"));
      user.setpassword(jo.getstring("pass"));
    } 
    
    request.setattribute("user", user);
    request.getrequestdispatcher("/message.jsp").forward(request, response);
  }
}

代码比较简陋，只是用于测试。希望能够有所收获。

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