一个Apache httpclient封装类

基于apache httpcomponents组件，首先依赖jar包

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.5.13</version>
</dependency>

先来看使用方法：

/**
 * @author tanghc
 */
public class HttpTest {


    /**
     * 普通get请求
     * @throws IOException
     */
    @Test
    public void get() throws IOException {
        String s = HttpHelper.get("http://localhost:8089/http/get")
                // 添加请求参数
                .parameter("id", "1")
                .parameter("name", "jim")
                .execute()
                .asString();
        System.out.println(s);
    }

    /**
     * post提交表单
     * @throws IOException
     */
    @Test
    public void postForm() throws IOException {
        Map<String, Object> form = new HashMap<>();
        form.put("id", 1);
        form.put("name", "tom");
        String s = HttpHelper.postForm("http://localhost:8089/http/postForm", form)
                .execute()
                .asString();
        System.out.println(s);
    }

    /**
     * post提交表单，并上传文件。multipart
     * @throws IOException
     */
    @Test
    public void postFormFile() throws IOException {
        Map<String, Object> form = new HashMap<>();
        HttpHelper.UploadFile file = new HttpHelper.UploadFile("file", "a.txt", "hello world".getBytes());
        form.put("id", 1);
        form.put("name", "tom");
        String s = HttpHelper.postForm("http://localhost:8089/http/postFormFile", form, file)
                .execute()
                .asString();
        System.out.println(s);
    }

    /**
     * post提交json
     * @throws IOException
     */
    @Test
    public void postJson() throws IOException {
        Map<String, Object> form = new HashMap<>();
        form.put("id", 1);
        form.put("name", "tom");
        String json = JSON.toJSONString(form);
        String s = HttpHelper.postJson("http://localhost:8089/http/postJson", json)
                .execute()
                .asString();
        System.out.println(s);
    }

    /**
     * 设置header
     * @throws IOException
     */
    @Test
    public void setHeader() throws IOException {
        String s = HttpHelper.get("http://localhost:8089/http/header")
                // 设置单个header
                .header("token", "xxx")
                .execute()
                .asString();
        System.out.println(s);

        Map<String, String> headers = new HashMap<>();
        headers.put("token", "bbbb");
        String s2 = HttpHelper.get("http://localhost:8089/http/header")
                // 设置全部header
                .headers(headers)
                .execute()
                .asString();
        System.out.println(s2);
    }

    /**
     * 返回流
     * @throws IOException
     */
    @Test
    public void getStream() throws IOException {
        InputStream inputStream = HttpHelper.get("http://localhost:8089/http/stream")
                .execute()
                .asStream();
        String s = IOUtils.toString(inputStream);
        System.out.println(s);
    }

    /**
     * 获取http状态
     * @throws IOException
     */
    @Test
    public void getStatus() throws IOException {
        HttpHelper.ResponseResult responseResult = HttpHelper.get("http://localhost:8089/http/get")
                .parameter("id", "1")
                .parameter("name", "jim")
                .execute();
        int status = responseResult.getStatus();
        if (status == HttpStatus.SC_OK) {
            System.out.println(responseResult.asString());
        }
    }

    /**
     * 获取响应头
     * @throws IOException
     */
    @Test
    public void getHeaders() throws IOException {
        Map<String, Object> form = new HashMap<>();
        form.put("id", 1);
        form.put("name", "tom");
        String json = JSON.toJSONString(form);
        HttpHelper.ResponseResult responseResult = HttpHelper.postJson("http://localhost:8089/http/responseHeader", json)
                .execute();
        Map<String, String> headers = responseResult.getHeaders();
        System.out.println(headers.get("code"));
        System.out.println(headers.get("token"));
        System.out.println(responseResult.asString());
    }

    /**
     * 获取HttpResponse对象
     * @throws IOException
     */
    @Test
    public void getResponse() throws IOException {
        HttpHelper.ResponseResult responseResult = HttpHelper.get("http://localhost:8089/http/get")
                .parameter("id", "1")
                .parameter("name", "jim")
                .execute();
        HttpResponse response = responseResult.getResponse();
        Locale locale = response.getLocale();
        System.out.println(locale);
    }

    /**
     * 自定义
     * @throws IOException
     */
    @Test
    public void custom() throws IOException {
        String s = HttpHelper.create()
                .url("http://localhost:8089/http/get")
                .method("get")
                .parameter("id", "1")
                .parameter("name", "jim")
                .header("token", "xx")
                .execute()
                .asString();
        System.out.println(s);

        String json = "{ \"name\": \"Jim\" }";
        String s2 = HttpHelper.create()
                .url("http://localhost:8089/http/postJson")
                .method("POST")
                .header("token", "xx")
                .entity(new StringEntity(json, ContentType.APPLICATION_JSON))
                .execute()
                .asString();
        System.out.println(s2);
    }

}

源码地址：HttpHelper.java