Java http工具类

在项目中快速发起http请求

一、添加依赖

<dependency>
    <groupId>cn.gjing</groupId>
    <artifactId>tools-httpclient</artifactId>
    <version>1.0.2</version>
</dependency>

二、项目使用

1、HTTP请求（GET案例）

public static void main(String[] args) {    
    HttpClient client = new HttpClient();
    Map<String, String> map = new HashMap<>(16);
    map.put("a", "参数a");
    map.put("b", "参数b");
    //发送http请求
    String result = client.get("http://127.0.0.1:8080/test", map, String.class);
    System.out.println(result);
}

2、HTTPS请求（POST案例）

public static void main(String[] args) {    
    HttpClient client = new HttpClient();
    Map<String, String> map = new HashMap<>(16);
    map.put("a", "参数a");
    map.put("b", "参数b");
    //发送https请求
    Map result = client.post("https://127.0.0.1:8080/test", map, Map.class);
    System.out.println(result.toString());
}

3、DELETE案例

public static void main(String[] args) {   
    HttpClient client = new HttpClient(); 
    ResultBean result = client.delete("http://127.0.0.1:8080/test/1", ResultBean.class);
    System.out.println(result.toString());
}

4、PUT案例

public static void main(String[] args) {   
    HttpClient client = new HttpClient(); 
    Integer result = client.put("https://127.0.0.1:8080/test/2", Integer.class);
    System.out.println(result);
}

三、HttpClient参数说明

必填项参数除外的任意参数不需要时可直接传null

响应结果返回类型最好设置与目标方法一致，否则可能会出现转换异常，如下：

• 目标方法

@GetMapping("/test")
public Integer test() {
    return 1111;
}

• 调用方

public static void main(String[] args) {
    HttpClient client = new HttpClient();
    Map result = client.get("http://127.0.0.1:8080/test", Map.class);
    System.out.println(result.toString());
}

由于目标方法返回的为Integer类型，不是key，value类型，故调用方使用Map接收会出现转换异常。

四、 UrlUtil工具类

1、urlAppend

Url拼接, 返回结果格式如: http://xxx/param1/param2

public static void main(String[] args) {
        String url = "http://127.0.0.1:8080/";
        Object[] param = {1, 2, 3, 4};
        UrlUtil.urlAppend(url, param);
    }

2、paramUnicodeSort

参数按照字段名的Unicode码从小到大排序(字典序), 得到的结果格式如: a=参数1&b=参数2

public static void main(String[] args) {
        Map<String, Object> map = new HashMap<>(16);
        map.put("a", "参数1");
        map.put("b", "参数2");
        UrlUtil.paramUnicodeSort(map, false, false);
    }

参数说明

3、urlParamToMap

将URL地址后带的参数转成map

public static void main(String[] args) {
        String url = "http://127.0.0.1:8080?a=2&b=2";
        UrlUtil.urlParamToMap(url);
    }

项目源代码可前往GitHUb查看：tools-httpclient