创建httpClientConfig配置类
@Configuration
@PropertySource(value="classpath:/properties/httpClient.properties")
public class HttpClientConfig {
@Value("${http.maxTotal}")
private Integer maxTotal; //最大连接数 @Value("${http.defaultMaxPerRoute}")
private Integer defaultMaxPerRoute; //最大并发链接数 @Value("${http.connectTimeout}")
private Integer connectTimeout; //创建链接的最大时间 @Value("${http.connectionRequestTimeout}")
private Integer connectionRequestTimeout; //链接获取超时时间 @Value("${http.socketTimeout}")
private Integer socketTimeout; //数据传输最长时间 @Value("${http.staleConnectionCheckEnabled}")
private boolean staleConnectionCheckEnabled; //提交时检查链接是否可用 //定义httpClient链接池
@Bean(name="httpClientConnectionManager")
public PoolingHttpClientConnectionManager getPoolingHttpClientConnectionManager() {
PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager();
manager.setMaxTotal(maxTotal); //设定最大链接数
manager.setDefaultMaxPerRoute(defaultMaxPerRoute); //设定并发链接数
return manager;
} //定义HttpClient
/**
* 实例化连接池，设置连接池管理器。
* 这里需要以参数形式注入上面实例化的连接池管理器
@Qualifier 指定bean标签进行注入
*/
@Bean(name = "httpClientBuilder")
public HttpClientBuilder getHttpClientBuilder(@Qualifier("httpClientConnectionManager")PoolingHttpClientConnectionManager httpClientConnectionManager){ //HttpClientBuilder中的构造方法被protected修饰，所以这里不能直接使用new来实例化一个HttpClientBuilder,可以使用HttpClientBuilder提供的静态方法create()来获取HttpClientBuilder对象
HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
httpClientBuilder.setConnectionManager(httpClientConnectionManager);
return httpClientBuilder;
} /**
* 注入连接池，用于获取httpClient
* @param httpClientBuilder
* @return
*/
@Bean
public CloseableHttpClient getCloseableHttpClient(@Qualifier("httpClientBuilder") HttpClientBuilder httpClientBuilder){ return httpClientBuilder.build();
} /**
* Builder是RequestConfig的一个内部类
* 通过RequestConfig的custom方法来获取到一个Builder对象
* 设置builder的连接信息
* @return
*/
@Bean(name = "builder")
public RequestConfig.Builder getBuilder(){
RequestConfig.Builder builder = RequestConfig.custom();
return builder.setConnectTimeout(connectTimeout)
.setConnectionRequestTimeout(connectionRequestTimeout)
.setSocketTimeout(socketTimeout)
.setStaleConnectionCheckEnabled(staleConnectionCheckEnabled);
} /**
* 使用builder构建一个RequestConfig对象
* @param builder
* @return
*/
@Bean
public RequestConfig getRequestConfig(@Qualifier("builder") RequestConfig.Builder builder){
return builder.build();
}
}
创建HttpClientClose关闭配置类
@Component //交给spring容器管理
public class HttpClientClose extends Thread{
@Autowired
private PoolingHttpClientConnectionManager manage;
private volatile boolean shutdown; //开关 volatitle表示多线程可变数据,一个线程修改,其他线程立即修改 public HttpClientClose() {
///System.out.println("执行构造方法,实例化对象");
//线程开启启动
this.start();
} @Override
public void run() {
try {
//如果服务没有关闭,执行线程
while(!shutdown) {
synchronized (this) {
wait(5000); //等待5秒
//System.out.println("线程开始执行,关闭超时链接");
//关闭超时的链接
PoolStats stats = manage.getTotalStats();
int av = stats.getAvailable(); //获取可用的线程数量
int pend = stats.getPending(); //获取阻塞的线程数量
int lea = stats.getLeased(); //获取当前正在使用的链接数量
int max = stats.getMax();
//System.out.println("max/"+max+": av/"+av+": pend/"+pend+": lea/"+lea);
manage.closeExpiredConnections();
}
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException();
} super.run();
} //关闭清理无效连接的线程
@PreDestroy //容器关闭时执行该方法.
public void shutdown() {
shutdown = true;
synchronized (this) {
//System.out.println("关闭全部链接!!");
notifyAll(); //全部从等待中唤醒.执行关闭操作;
}
}
编写工具类HttpClientService
@Service
public class HttpClientService { @Autowired
private CloseableHttpClient httpClient;
@Autowired
private RequestConfig requestConfig; /**
* 通过给的url地址，获取服务器数据
* @param url 服务器地址
* @param params 封装用户参数
* @param charset 设定字符编码
* @return
*/
public String doGet(String url, Map<String,String> params,String charset) {
if (StringUtils.isEmpty(charset)) {
charset = "utf-8";
}
//判断是否有参数
if (params != null) {
url +="?";
for (Map.Entry<String,String> entry: params.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
url += key +"="+value+"&";
}
url = url.substring(0,url.length() - 1);
}
HttpGet httpGet = new HttpGet(url);
httpGet.setConfig(requestConfig);
String result = "";
try {
CloseableHttpResponse response = httpClient.execute(httpGet);
if (response.getStatusLine().getStatusCode() == 200) {
result = EntityUtils.toString(response.getEntity(),charset);
}
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
return result;
} public String doGet(String url, Map<String,String> params) {
return doGet(url,params,null);
}
public String doGet(String url) {
return doGet(url,null,null);
} public <T> T doGet(String url,Class<T> tClass,Map<String,String> map, String charSet){
String result = doGet(url,map,charSet);
return ObjectMapperUtil.toObject(result, tClass);
} }
测试类：
@SpringBootTest
@RunWith(SpringRunner.class)
public class HttpClientTest {
@Autowired
private HttpClientService httpClientService;
@Test
public void getTest1() {
//次url是通过nginx加hosts文件映射的，需要修改url才可以使用
String url = "http://manage.jt.com/web/item/findItemDescById";
Map<String,String> map = new HashMap<>();
map.put("itemId","562379");
String s = httpClientService.doGet(url, map);
System.out.println(s); }