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Delphi 通过IdHTTP 发送Http请求到Java 后台
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1 定义一个Java Servlet "ServletDelphi"处理请求;具体参考Servlet的文档
文件:ServletDelphi.java
import java.io.IOException;
import java.io.PrintWriter;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;




public class ServletDelphi extends HttpServlet {


/**
* Constructor of the object.
*/
public ServletDelphi() {
super();
}


/**
* Destruction of the servlet.

*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}


/**
* The doGet method of the servlet.

*
* This method is called when a form has its tag value method equals to get.
* 
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.getWriter().println("Hello Servlet Delphi!");
}


/**
* The doPost method of the servlet.

*
* This method is called when a form has its tag value method equals to post.
* 
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.getWriter().println("Hello Servlet, " + request.getParameter("user") + "!");
}


/**
* Initialization of the servlet.

*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}


}




2 在Delphi上定义两个Button单击事件
//Post请求
procedure TForm1.Button1Click(Sender: TObject);
var
  Url : string;//请求地址
  ParamList :TStringList;//请求参数列表
  ResponseStream : TStringStream; //返回信息
  ResponseStr : string;
begin
  ParamList := TStringList.Create;
  ParamList.Add('user=linlf');  
  ResponseStream := TStringStream.Create('');
  try
    //请求地址
    Url := 'http://localhost:8080/testdelphi/servlet/ServletDelphi';
    try
    IdHTTP1.Post(Url, ParamList,ResponseStream);
    //      IdHTTP1.Get(Url,ResponseStream);
    except
      on e : Exception do
      begin
        ShowMessage(e.Message);
      end;
    end;
    //获取网页返回的信息
    ResponseStr := ResponseStream.DataString;
    //网页中的存在中文时，需要进行UTF8解码
    ResponseStr := UTF8Decode(ResponseStr);
    Memo1.Text :=   ResponseStr;


    
  finally


    //IdHTTP1.Free;
//    ResponseStream.Free;
  end;


end;


//Get请求
procedure TForm1.Button2Click(Sender: TObject);
var
  Url : string;//请求地址
  ResponseStream : TStringStream; //返回信息
  ResponseStr : string;
begin
   ResponseStream := TStringStream.Create('');
  try
    //请求地址
    Url := 'http://localhost:8080/testdelphi/servlet/ServletDelphi';
    try
       IdHTTP1.Get(Url,ResponseStream);
    except
      on e : Exception do
      begin
        ShowMessage(e.Message);
      end;
    end;
    //获取网页返回的信息
    ResponseStr := ResponseStream.DataString;
    //网页中的存在中文时，需要进行UTF8解码
    ResponseStr := UTF8Decode(ResponseStr);
    Memo1.Text :=   ResponseStr;


    
  finally


    //IdHTTP1.Free;
//    ResponseStream.Free;
  end;
end;






3 验证通过
Memo1输出正确的结果


4 问题记录
1)IdHTTP控件在Indy Clients的栏目中
2)   finally
    //IdHTTP1.Free;
//    ResponseStream.Free;
这两个注释掉，否则重复点击的时候会卡住.

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