工作流完成后的回调listener

src/main/java/com/common/workflow/service/activiti/custom/TaskCompleteCallbackListener.java

@@ -0,0 +1,21 @@
+package com.common.workflow.service.activiti.custom;
+
+import com.common.workflow.service.util.HttpRequest;
+import org.activiti.engine.delegate.DelegateTask;
+import org.activiti.engine.delegate.TaskListener;
+
+/**
+ * Created by gyue on 2019-04-15.
+ */
+public class TaskCompleteCallbackListener implements TaskListener {
+    public void notify(DelegateTask delegateTask) {
+        String callbackUrl = delegateTask.getVariable("callbackUrl").toString();
+        String result = delegateTask.getVariable("result").toString();
+        String bussinessKey = delegateTask.getVariable("businessKey").toString();
+        String taskDefinitionKey = delegateTask.getTaskDefinitionKey();
+        if (callbackUrl.length() > 0) {
+            String s = HttpRequest.sendGet(callbackUrl, "result=" + result + "&bussinessKey=" + bussinessKey + "&taskDefinitionKey" + taskDefinitionKey);
+            System.out.println(s);
+        }
+    }
+}

src/main/java/com/common/workflow/service/util/HttpRequest.java

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+package com.common.workflow.service.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.List;
+import java.util.Map;
+
+public class HttpRequest {
+    /**
+     * 向指定URL发送GET方法的请求
+     *
+     * @param url
+     *            发送请求的URL
+     * @param param
+     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
+     * @return URL 所代表远程资源的响应结果
+     */
+    public static String sendGet(String url, String param) {
+        String result = "";
+        BufferedReader in = null;
+        try {
+            String urlNameString = url + "?" + param;
+            URL realUrl = new URL(urlNameString);
+            // 打开和URL之间的连接
+            URLConnection connection = realUrl.openConnection();
+            // 设置通用的请求属性
+            connection.setRequestProperty("accept", "*/*");
+            connection.setRequestProperty("connection", "Keep-Alive");
+            connection.setRequestProperty("user-agent",
+                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
+            // 建立实际的连接
+            connection.connect();
+            // 获取所有响应头字段
+            Map<String, List<String>> map = connection.getHeaderFields();
+            // 遍历所有的响应头字段
+            for (String key : map.keySet()) {
+                System.out.println(key + "--->" + map.get(key));
+            }
+            // 定义 BufferedReader输入流来读取URL的响应
+            in = new BufferedReader(new InputStreamReader(
+                connection.getInputStream()));
+            String line;
+            while ((line = in.readLine()) != null) {
+                result += line;
+            }
+        } catch (Exception e) {
+            System.out.println("发送GET请求出现异常！" + e);
+            e.printStackTrace();
+        }
+        // 使用finally块来关闭输入流
+        finally {
+            try {
+                if (in != null) {
+                    in.close();
+                }
+            } catch (Exception e2) {
+                e2.printStackTrace();
+            }
+        }
+        return result;
+    }
+
+    /**
+     * 向指定 URL 发送POST方法的请求
+     *
+     * @param url
+     *            发送请求的 URL
+     * @param param
+     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
+     * @return 所代表远程资源的响应结果
+     */
+    public static String sendPost(String url, String param) {
+        PrintWriter out = null;
+        BufferedReader in = null;
+        String result = "";
+        try {
+            URL realUrl = new URL(url);
+            // 打开和URL之间的连接
+            URLConnection conn = realUrl.openConnection();
+            // 设置通用的请求属性
+            conn.setRequestProperty("accept", "*/*");
+            conn.setRequestProperty("connection", "Keep-Alive");
+            conn.setRequestProperty("user-agent",
+                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
+            // 发送POST请求必须设置如下两行
+            conn.setDoOutput(true);
+            conn.setDoInput(true);
+            // 获取URLConnection对象对应的输出流
+            out = new PrintWriter(conn.getOutputStream());
+            // 发送请求参数
+            out.print(param);
+            // flush输出流的缓冲
+            out.flush();
+            // 定义BufferedReader输入流来读取URL的响应
+            in = new BufferedReader(
+                new InputStreamReader(conn.getInputStream()));
+            String line;
+            while ((line = in.readLine()) != null) {
+                result += line;
+            }
+        } catch (Exception e) {
+            System.out.println("发送 POST 请求出现异常！"+e);
+            e.printStackTrace();
+        }
+        //使用finally块来关闭输出流、输入流
+        finally{
+            try{
+                if(out!=null){
+                    out.close();
+                }
+                if(in!=null){
+                    in.close();
+                }
+            }
+            catch(IOException ex){
+                ex.printStackTrace();
+            }
+        }
+        return result;
+    }
+}