Java调用Restful方式之RestTemplate

1.spring-mvc.xml中增加RestTemplate的配置

<!-- 配置RestTemplate -->
    <!--Http client Factory -->
    <bean id="httpClientFactory"
        class="org.springframework.http.client.SimpleClientHttpRequestFactory">
        <property name="connectTimeout" value="10000" />
        <property name="readTimeout" value="10000" />
    </bean>

    <!--RestTemplate -->
    <bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
        <constructor-arg ref="httpClientFactory" />
    </bean>

2.引入相关jar包

httpclient-4.3.3.jar、httpcore-4.3.2.jar，jar包版本根据需求自行调整。

3.Controller中使用

import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;

import net.sf.json.JSONObject;
@Controller
public class RestTestController {
	//注入restTemplate
	@Autowired
	private  RestTemplate restTemplate;
	/**
	 * restful接口测试
	 * @return
	 */
	@RequestMapping(value = "/restTest")
	public String restTest(Model model){
		//restful请求地址
		String url = "http://127.0.0.1:8081/demo/contact/getContactDb";
		String json = restTemplate.getForObject(url, String.class);
		
		JSONObject obj = JSONObject.fromObject(json);
		String state = (String) obj.get("state");
		
		System.out.println(json);
		try {

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "main/test";
	}
}