Java调用Http接口(3)--Commons-HttpClient调用Http接口

commons-httpclient原来是apache commons项目下的一个组件，现已被httpcomponents项目所取代；作为调用http接口的一种选择，本文介绍下其使用方法。文中所使用到的软件版本：java 1.8.0_191、commons-httpclient 3.1。

1、服务端

参见java调用http接口(1)--编写服务端 

2、调用

2.1、get请求

public static void get() {
    try {
        string requestpath = "http://localhost:8080/webframe/demo/test/getuser?userid=1000&username=" + urlencoder.encode("李白", "utf-8");
        httpclient httpclient = new httpclient();
        getmethod get = new getmethod(requestpath);
        int status = httpclient.executemethod(get);
        if (status == httpstatus.sc_ok) {
            system.out.println("get返回结果：" + get.getresponsebodyasstring());
        } else {
            system.out.println("get返回状态码：" + status);
        }
    } catch (exception e) {
        e.printstacktrace();
    }
}

2.2、post请求(发送键值对数据）

public static void post() {
    try {
        string requestpath = "http://localhost:8080/webframe/demo/test/getuser";
        httpclient httpclient = new httpclient();
        postmethod post = new postmethod(requestpath);
        post.addrequestheader("content-type", "application/x-www-form-urlencoded;charset=utf-8");
        string param = "userid=1000&username=李白";
        post.setrequestentity(new stringrequestentity(param));
        int status = httpclient.executemethod(post);
        if (status == httpstatus.sc_ok) {
            system.out.println("post返回结果：" + post.getresponsebodyasstring());
        } else {
            system.out.println("post返回状态码：" + status);
        }
    } catch (exception e) {
        e.printstacktrace();
    }
}

2.3、post请求(发送json数据）

public static void post2() {
    try {
        string requestpath = "http://localhost:8080/webframe/demo/test/adduser";
        httpclient httpclient = new httpclient();
        postmethod post = new postmethod(requestpath);
        post.addrequestheader("content-type", "application/json");
        string param = "{\"userid\": \"1001\",\"username\":\"杜甫\"}";
        post.setrequestentity(new stringrequestentity(param));
        int status = httpclient.executemethod(post);
        if (status == httpstatus.sc_ok) {
            system.out.println("post返回结果：" + post.getresponsebodyasstring());
        } else {
            system.out.println("post返回状态码：" + status);
        }
    } catch (exception e) {
        e.printstacktrace();
    }
}

2.4、上传文件及发送键值对数据

public static void multi() {
    try {
        string requestpath = "http://localhost:8080/webframe/demo/test/multi";
        httpclient httpclient = new httpclient();
        postmethod post = new postmethod(requestpath);

        file file = new file("d:/a.jpg");
        part[] parts = {new filepart("file", file), new stringpart("param1", "参数1", "utf-8"), new stringpart("param2", "参数2", "utf-8")};
        
        post.setrequestentity(new multipartrequestentity(parts, post.getparams()));
        int status = httpclient.executemethod(post);
        if (status == httpstatus.sc_ok) {
            system.out.println("multi返回结果：" + post.getresponsebodyasstring());
        } else {
            system.out.println("multi返回状态码：" + status);
        }
    } catch (exception e) {
        e.printstacktrace();
    }
}

2.5、完整例子

package com.inspur.http;

import java.io.file;
import java.net.urlencoder;

import org.apache.commons.httpclient.httpclient;
import org.apache.commons.httpclient.httpstatus;
import org.apache.commons.httpclient.methods.getmethod;
import org.apache.commons.httpclient.methods.postmethod;
import org.apache.commons.httpclient.methods.stringrequestentity;
import org.apache.commons.httpclient.methods.multipart.filepart;
import org.apache.commons.httpclient.methods.multipart.multipartrequestentity;
import org.apache.commons.httpclient.methods.multipart.part;
import org.apache.commons.httpclient.methods.multipart.stringpart;

/**
 * 
 * 通过commons-httpclient调用http接口
 *
 */
public class commonshttpclientcase {
    /**
     *  get请求
     */
    public static void get() {
        try {
            string requestpath = "http://localhost:8080/webframe/demo/test/getuser?userid=1000&username=" + urlencoder.encode("李白", "utf-8");
            httpclient httpclient = new httpclient();
            getmethod get = new getmethod(requestpath);
            int status = httpclient.executemethod(get);
            if (status == httpstatus.sc_ok) {
                system.out.println("get返回结果：" + get.getresponsebodyasstring());
            } else {
                system.out.println("get返回状态码：" + status);
            }
        } catch (exception e) {
            e.printstacktrace();
        }
    }
    
    /**
     *  post请求(发送键值对数据)
     */
    public static void post() {
        try {
            string requestpath = "http://localhost:8080/webframe/demo/test/getuser";
            httpclient httpclient = new httpclient();
            postmethod post = new postmethod(requestpath);
            post.addrequestheader("content-type", "application/x-www-form-urlencoded;charset=utf-8");
            string param = "userid=1000&username=李白";
            post.setrequestentity(new stringrequestentity(param));
            int status = httpclient.executemethod(post);
            if (status == httpstatus.sc_ok) {
                system.out.println("post返回结果：" + post.getresponsebodyasstring());
            } else {
                system.out.println("post返回状态码：" + status);
            }
        } catch (exception e) {
            e.printstacktrace();
        }
    }
    
    /**
     *  post请求(发送json数据)
     */
    public static void post2() {
        try {
            string requestpath = "http://localhost:8080/webframe/demo/test/adduser";
            httpclient httpclient = new httpclient();
            postmethod post = new postmethod(requestpath);
            post.addrequestheader("content-type", "application/json");
            string param = "{\"userid\": \"1001\",\"username\":\"杜甫\"}";
            post.setrequestentity(new stringrequestentity(param));
            int status = httpclient.executemethod(post);
            if (status == httpstatus.sc_ok) {
                system.out.println("post返回结果：" + post.getresponsebodyasstring());
            } else {
                system.out.println("post返回状态码：" + status);
            }
        } catch (exception e) {
            e.printstacktrace();
        }
    }
    
    /**
     * 上传文件及发送键值对数据
     */
    public static void multi() {
        try {
            string requestpath = "http://localhost:8080/webframe/demo/test/multi";
            httpclient httpclient = new httpclient();
            postmethod post = new postmethod(requestpath);

            file file = new file("d:/a.jpg");
            part[] parts = {new filepart("file", file), new stringpart("param1", "参数1", "utf-8"), new stringpart("param2", "参数2", "utf-8")};
            
            post.setrequestentity(new multipartrequestentity(parts, post.getparams()));
            int status = httpclient.executemethod(post);
            if (status == httpstatus.sc_ok) {
                system.out.println("multi返回结果：" + post.getresponsebodyasstring());
            } else {
                system.out.println("multi返回状态码：" + status);
            }
        } catch (exception e) {
            e.printstacktrace();
        }
    }
    
    public static void main(string[] args) {
        get();
        post();
        post2();
        multi();
    }

}