Java基于HttpClient实现RPC的示例

com.mrshun.controller.DemoController

@Controller
public class DemoController {
    @RequestMapping("/demo")
    @ResponseBody
    public String demo(String param){
        return "demo"+param;
    }
}

com.mrshun.HttpClientServerApplication

@SpringBootApplication
public class HttpClientServerApplication {
    public static void main(String[] args) {
    SpringApplication.run(HttpClientServerApplication.class,args);
    }
}

<dependencies>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.10</version>
    </dependency>
</dependencies>

public static void main(String[] args) {
    try {
     //创建http工具（理解成:浏览器） 发起请求，解析响应
        CloseableHttpClient httpClient = HttpClients.createDefault();
        //请求路径
        URIBuilder uriBuilder = new URIBuilder("http://localhost:8080/demo");
        uriBuilder.addParameter("param", "get123");
        //创建HttpGet请求对象
        HttpGet get = new HttpGet(uriBuilder.build());
        //创建响应对象
        CloseableHttpResponse response = httpClient.execute(get);
        //由于响应体是字符串，因此把HttpEntity类型转换为字符串类型，并设置字符编码
        String result = EntityUtils.toString(response.getEntity(), "utf-8");
        //输出结果
        System.out.println(result);
        //释放资源
        response.close();
        httpClient.close();
    } catch (URISyntaxException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public class HttpClientDemo {
    public static void main(String[] args) {
        try {
         //创建http工具（理解成:浏览器） 发起请求，解析响应
            CloseableHttpClient httpClient = HttpClients.createDefault();
            //创建HttpPOST请求对象
            HttpPost post = new HttpPost("http://localhost:8080/demo");
            //所有请求参数
            List<NameValuePair> params = new ArrayList<>();
            params.add(new BasicNameValuePair("param","123"));
            //创建HttpEntity接口的文本实现类的对象，放入参数并设置编码
            HttpEntity httpEntity = new UrlEncodedFormEntity(params,"utf-8");
            //放入到HttpPost对象中
            post.setEntity(httpEntity);            
            //创建响应对象
            CloseableHttpResponse response = httpClient.execute(post);
            //由于响应体是字符串，因此把HttpEntity类型转换为字符串类型
            String result = EntityUtils.toString(response.getEntity());
            //输出结果
            System.out.println(result);
            //释放资源
            response.close();
            httpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

ObjectMapper objectMapper = new ObjectMapper();
People peo = new People();
objectMapper.writeValueAsString(peo);

ObjectMapper objectMapper = new ObjectMapper();
People peo = objectMapper.readValue(content, People.class);

ObjectMapper objectMapper = new ObjectMapper();
JavaType javaType = objectMapper.getTypeFactory().constructParametricType(List.class, People.class);
List<People> list = objectMapper.readValue(content, javaType);

public class HttpClientDemo {
    public static void main(String[] args) {
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpPost post = new HttpPost("http://localhost:8080/demo");
            HttpEntity httpEntity= null;
String json = "{}";
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            post.setEntity(entity);
            CloseableHttpResponse response = httpClient.execute(post);
            String result = EntityUtils.toString(response.getEntity());
            System.out.println(result);
            response.close();
            httpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

@RequestMapping("/demo4")
@ResponseBody
public String demo4(@RequestBody List<People> list) {
    System.out.println(list);
    return list.toString();
}

var json = '[{"id":123,"name":"mrshun"},{"id":123,"name":"zhangyongshun"}]';
 $.ajax({
     url:'/demo5',
     type:'post',
     success:function(data){
         alert(data);
         for(var i = 0 ;i<data.length;i++){

             alert(data[i].id +"  "+data[i].name);
         }
     },
     contentType:'application/json',//请求体中内容类型
     dataType:'json',//响应内容类型。
     data:json
 });

var json = '[{"id":123,"name":"mrshun"},{"id":456,"name":"zhangyongshun"}]';
 $.ajax({
     url:'/demo5',
     type:'post',
     success:function(data){
         alert(data);
         for(var i = 0 ;i<data.length;i++){

             alert(data[i].id +"  "+data[i].name);
         }
     },
     contentType:'application/json',//请求体中内容类型
     dataType:'json',//响应内容类型。
     data:json
 });