add example for sending message with image

emchat-server-java/src/main/resources/logback.xml

@@ -3,7 +3,7 @@
 
     <contextName>logback</contextName>
 
-    <property name="log.path" value="c:/java-client-log/log.log" />
+    <property name="log.path" value="/java-client-log/log.log" />
 
     <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
         <!-- <filter class="com.example.logback.filter.MyFilter" /> -->

emchat-server-java/src/test/com/easemob/SendMessageTest.java

@@ -1,6 +1,8 @@
 package com.easemob;
 
 import com.easemob.server.example.api.impl.EasemobSendMessage;
+import com.google.gson.GsonBuilder;
+import com.google.gson.annotations.SerializedName;
 import io.swagger.client.model.Msg;
 import io.swagger.client.model.MsgContent;
 import io.swagger.client.model.UserName;
@@ -13,7 +15,7 @@ public class SendMessageTest {
     private EasemobSendMessage easemobSendMessage = new EasemobSendMessage();
 
     @Test
-    public void send() {
+    public void sendText() {
         Msg msg = new Msg();
         MsgContent msgContent = new MsgContent();
         msgContent.type(MsgContent.TypeEnum.TXT).msg("helloword");
@@ -23,4 +25,55 @@ public void send() {
         Object result = easemobSendMessage.sendMessage(msg);
         System.out.println(result);
     }
+
+    @Test
+    public void sendImage() {
+        Msg msg = new Msg();
+        ImageMsgContent msgContent = new ImageMsgContent();
+        msgContent.url("http://test_url").secret("test_sec").filename("filename").size(new ImageMsgContent.Size(480, 720))
+                .type(MsgContent.TypeEnum.IMG).msg("this is an image message");
+        UserName userName = new UserName();
+        userName.add("receiver");
+        msg.from("sender").target(userName).targetType("users").msg(msgContent);
+        System.out.println(new GsonBuilder().create().toJson(msg));
+        Object result = easemobSendMessage.sendMessage(msg);
+        System.out.println(result);
+    }
+
+    static class ImageMsgContent extends MsgContent {
+        private String url;
+        private String filename;
+        private String secret;
+        private Size size;
+
+        ImageMsgContent url(String url) {
+            this.url = url;
+            return this;
+        }
+
+        ImageMsgContent filename(String filename) {
+            this.filename = filename;
+            return this;
+        }
+
+        ImageMsgContent secret(String secret) {
+            this.secret = secret;
+            return this;
+        }
+
+        ImageMsgContent size(Size size) {
+            this.size = size;
+            return this;
+        }
+
+        static class Size {
+            private long width;
+            private long height;
+
+            Size(long width, long height) {
+                this.width = width;
+                this.height = height;
+            }
+        }
+    }
 }