开发
Bean模式(基于方法)
Bean模式任务，支持基于方法的开发方式，每个任务对应一个方法。基于方法开发的任务，底层会生成JobHandler代理，和基于类的方式一样，任务也会以JobHandler的形式存在于执行器任务容器中。
优点：
- 每个任务只需要开发一个方法，并添加”@XxlJob”注解即可，更加方便、快速。
- 支持自动扫描任务并注入到执行器容器。
缺点：要求Spring容器环境；
开发步骤：
- 任务开发：在Spring Bean实例中，开发Job方法；
- 注解配置：为Job方法添加注解 "@XxlJob(value="自定义jobhandler名称", init = "JobHandler初始化方法", destroy = "JobHandler销毁方法")"，注解value值对应的是调度中心新建任务的JobHandler属性的值。
- 执行日志：需要通过 "XxlJobHelper.log" 打印执行日志；
- 任务结果：默认任务结果为 "成功" 状态，不需要主动设置；如有诉求，比如设置任务结果为失败，可以通过 "XxlJobHelper.handleFail/handleSuccess" 自主设置任务结果；
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Arrays;import com.xxl.job.core.context.XxlJobHelper;
import com.xxl.job.core.handler.annotation.XxlJob;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;@Slf4j
@Component
public class BeanMethodDemoJob {/*** 1、简单任务示例（Bean模式）*/@XxlJob("demoJobHandler")public void demoJobHandler() {XxlJobHelper.log("demoJobHandler execute...");}/*** 2、分片广播任务*/@XxlJob("shardingJobHandler")public void shardingJobHandler() throws Exception {// logback console日志log.info("shardingJobHandler execute...");// 通过xxl记录到DB中的日志XxlJobHelper.log("shardingJobHandler execute...");// 分片参数int shardIndex = XxlJobHelper.getShardIndex();int shardTotal = XxlJobHelper.getShardTotal();XxlJobHelper.log("分片参数：当前分片序号 = {}, 总分片数 = {}", shardIndex, shardTotal);// 业务逻辑for (int i = 0; i < shardTotal; i++) {if (i==shardIndex) {XxlJobHelper.log("第 {} 片, 命中分片开始处理", i);} else {XxlJobHelper.log("第 {} 片, 忽略", i);}}}/*** 3、命令行任务*/@XxlJob("commandJobHandler")public void commandJobHandler() throws Exception {XxlJobHelper.log("commandJobHandler execute...");String command = XxlJobHelper.getJobParam();int exitValue = -1;BufferedReader bufferedReader = null;try {// command processProcessBuilder processBuilder = new ProcessBuilder();processBuilder.command(command);processBuilder.redirectErrorStream(true);Process process = processBuilder.start();//Process process = Runtime.getRuntime().exec(command);BufferedInputStream bufferedInputStream = new BufferedInputStream(process.getInputStream());bufferedReader = new BufferedReader(new InputStreamReader(bufferedInputStream));// command logString line;while ((line = bufferedReader.readLine())!=null) {XxlJobHelper.log(line);}// command exitprocess.waitFor();exitValue = process.exitValue();} catch (Exception e) {XxlJobHelper.log(e);} finally {if (bufferedReader!=null) {bufferedReader.close();}}if (exitValue==0) {// default success} else {XxlJobHelper.handleFail("command exit value(" + exitValue + ") is failed");}}/*** 4、跨平台Http任务* 参数示例：* "url: http://www.baidu.com\n" +* "method: get\n" +* "data: content\n";*/@XxlJob("httpJobHandler")public void httpJobHandler() throws Exception {XxlJobHelper.log("httpJobHandler execute...");// param parseString param = XxlJobHelper.getJobParam();if (param==null || param.trim().length()==0) {XxlJobHelper.log("param[" + param + "] invalid.");XxlJobHelper.handleFail();return;}String[] httpParams = param.split("\n");String url = null;String method = null;String data = null;for (String httpParam : httpParams) {if (httpParam.startsWith("url:")) {url = httpParam.substring(httpParam.indexOf("url:") + 4).trim();}if (httpParam.startsWith("method:")) {method = httpParam.substring(httpParam.indexOf("method:") + 7).trim().toUpperCase();}if (httpParam.startsWith("data:")) {data = httpParam.substring(httpParam.indexOf("data:") + 5).trim();}}// param validif (url==null || url.trim().length()==0) {XxlJobHelper.log("url[" + url + "] invalid.");XxlJobHelper.handleFail();return;}if (method==null || !Arrays.asList("GET", "POST").contains(method)) {XxlJobHelper.log("method[" + method + "] invalid.");XxlJobHelper.handleFail();return;}boolean isPostMethod = method.equals("POST");// requestHttpURLConnection connection = null;BufferedReader bufferedReader = null;try {// connectionURL realUrl = new URL(url);connection = (HttpURLConnection) realUrl.openConnection();// connection settingconnection.setRequestMethod(method);connection.setDoOutput(isPostMethod);connection.setDoInput(true);connection.setUseCaches(false);connection.setReadTimeout(5 * 1000);connection.setConnectTimeout(3 * 1000);connection.setRequestProperty("connection", "Keep-Alive");connection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");connection.setRequestProperty("Accept-Charset", "application/json;charset=UTF-8");// do connectionconnection.connect();// dataif (isPostMethod && data!=null && data.trim().length() > 0) {DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());dataOutputStream.write(data.getBytes("UTF-8"));dataOutputStream.flush();dataOutputStream.close();}// valid StatusCodeint statusCode = connection.getResponseCode();if (statusCode!=200) {throw new RuntimeException("Http Request StatusCode(" + statusCode + ") Invalid.");}// resultbufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));StringBuilder result = new StringBuilder();String line;while ((line = bufferedReader.readLine())!=null) {result.append(line);}String responseMsg = result.toString();XxlJobHelper.log(responseMsg);return;} catch (Exception e) {XxlJobHelper.log(e);XxlJobHelper.handleFail();return;} finally {try {if (bufferedReader!=null) {bufferedReader.close();}if (connection!=null) {connection.disconnect();}} catch (Exception e2) {XxlJobHelper.log(e2);}}}/*** 5、生命周期任务示例：任务初始化与销毁时，支持自定义相关逻辑；*/@XxlJob(value = "demoJobHandler2", init = "init", destroy = "destroy")public void demoJobHandler2() throws Exception {XxlJobHelper.log("demoJobHandler2, execute...");}public void init() {log.info("init");}public void destroy() {log.info("destroy");}}Bean模式(基于类)
优点：不限制项目环境，兼容性好。即使是无框架项目，如main方法直接启动的项目也可以提供支持，可以参考示例项目 “xxl-job-executor-sample-frameless”；
缺点：
- 每个任务需要占用一个Java类，造成类的浪费；
- 不支持自动扫描任务并注入到执行器容器，需要手动注入。
开发步骤：
- 执行器项目中，开发Job类：
- 开发一个继承自"com.xxl.job.core.handler.IJobHandler"的JobHandler类，实现其中任务方法。
- 手动通过如下方式注入到执行器容器。
- 注册jobHandler
- XxlJobExecutor.registJobHandler("xxxxxJobHandler", new xxxxxJobHandler());
- 注解 @JobHandler
@Slf4j
public class BeanClassDemoJob extends IJobHandler {@Overridepublic void execute() throws Exception {log.info("BeanClassDemoJob, execute...");}
}XxlJobExecutor.registJobHandler("beanClassDemoJobHandler", new BeanClassDemoJob());