diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 0d7b04d..21d3def 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,83 +2,9 @@
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+      <file leaf-file-name="WordCountApp.java" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java">
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+      <file leaf-file-name="Mapper.class" pinned="false" current-in-tab="false">
+        <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Mapper.class">
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@@ -147,6 +93,7 @@
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         <option value="$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java" />
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@@ -192,9 +139,9 @@
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     </navigator>
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-      <pane id="PackagesPane" />
-      <pane id="Scope" />
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+      <pane id="Scratches" />
+      <pane id="Scope" />
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@@ -220,14 +167,6 @@
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@@ -257,7 +196,7 @@
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+      <pane id="PackagesPane" />
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@@ -523,7 +462,10 @@
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       <workItem from="1523072856936" duration="1929000" />
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+      <workItem from="1523148734020" duration="6470000" />
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+      <workItem from="1523606327796" duration="135000" />
+      <workItem from="1523931905005" duration="3609000" />
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@@ -532,7 +474,14 @@
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       <updated>1521904777876</updated>
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+    <task id="LOCAL-00002" summary="JavaAPI基础操作单元测试编写并通过">
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+      <option name="number" value="00002" />
+      <option name="presentableId" value="LOCAL-00002" />
+      <option name="project" value="LOCAL" />
+      <updated>1523161044927</updated>
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+    <option name="localTasksCounter" value="3" />
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@@ -568,7 +517,7 @@
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@@ -576,20 +525,20 @@
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+      <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32936078" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
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   <component name="TypeScriptGeneratedFilesManager">
@@ -612,13 +561,92 @@
   </component>
   <component name="VcsManagerConfiguration">
     <MESSAGE value="建立初始工程" />
-    <option name="LAST_COMMIT_MESSAGE" value="建立初始工程" />
+    <MESSAGE value="JavaAPI基础操作单元测试编写并通过" />
+    <option name="LAST_COMMIT_MESSAGE" value="JavaAPI基础操作单元测试编写并通过" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager />
     <watches-manager />
   </component>
   <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/pom.xml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="782">
+          <caret line="34" column="40" lean-forward="false" selection-start-line="34" selection-start-column="40" selection-end-line="34" selection-end-column="40" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
+      <provider selected="true" editor-type-id="text-editor">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          </folding>
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+      <provider selected="true" editor-type-id="text-editor">
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+      </provider>
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+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+      <provider selected="true" editor-type-id="text-editor">
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+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
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+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/AppTest.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="161">
+          <caret line="9" column="13" lean-forward="false" selection-start-line="9" selection-start-column="13" selection-end-line="9" selection-end-column="13" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/fjy/hadoop/HDFSApp.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3105">
+          <caret line="135" column="20" lean-forward="false" selection-start-line="135" selection-start-column="20" selection-end-line="135" selection-end-column="20" />
+          <folding>
+            <element signature="imports" expanded="true" />
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+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/pom.xml">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="782">
@@ -641,8 +669,6 @@
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@@ -661,8 +687,6 @@
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@@ -681,8 +705,6 @@
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+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/App.java">
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+      </provider>
+    </entry>
+    <entry file="jar://$MAVEN_REPOSITORY$/org/apache/hadoop/hadoop-mapreduce-client-core/2.6.0-cdh5.7.0/hadoop-mapreduce-client-core-2.6.0-cdh5.7.0.jar!/org/apache/hadoop/mapreduce/Mapper.class">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java">
+      <provider selected="true" editor-type-id="text-editor">
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diff --git a/src/main/java/com/fjy/hadoop/App.java b/src/main/java/com/fjy/hadoop/App.java
deleted file mode 100644
index e9b4877..0000000
--- a/src/main/java/com/fjy/hadoop/App.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.fjy.hadoop;
-
-/**
- * Hello world!
- *
- */
-public class App 
-{
-    public static void main( String[] args )
-    {
-        System.out.println( "Hello World!" );
-    }
-}
diff --git a/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java b/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java
new file mode 100644
index 0000000..d25b696
--- /dev/null
+++ b/src/main/java/com/fjy/hadoop/mapreduce/WordCountApp.java
@@ -0,0 +1,123 @@
+package com.fjy.hadoop.mapreduce;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.Mapper;
+import org.apache.hadoop.mapreduce.Reducer;
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+
+import java.io.IOException;
+
+/**
+ * 使用MapReduce开发WordCount应用
+ */
+public class WordCountApp {
+    /**
+     * Map：读取输入文件
+     * Text:类似字符串
+     */
+    public static class MyMapper extends Mapper<LongWritable, Text, Text, LongWritable> {
+
+        LongWritable one = new LongWritable(1);
+
+        /**
+         * @param key     偏移量
+         * @param value   每行的字符串
+         * @param context 上下文
+         * @throws IOException
+         * @throws InterruptedException
+         */
+        @Override
+        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
+            /*super.map(key, value, context);*/
+
+            //接收到每一行数据
+            String line = value.toString();
+
+            //按照指定分隔符进行拆分
+            /*line.split("\t");//以Tab分隔*/
+            String[] words = line.split(" ");//以空格分隔
+
+            for (String word : words) {
+                //通过上下文把map的处理结果输出
+                context.write(new Text(word), one);
+            }
+        }
+    }
+
+    /**
+     * Reduce 归并操作
+     * LongWritable：文本出现的次数/求和后的次数
+     */
+    public static class MyReducer extends Reducer<Text, LongWritable, Text, LongWritable> {
+        /**
+         * @param key
+         * @param values  相同偏移量的集合
+         * @param context
+         * @throws IOException
+         * @throws InterruptedException
+         */
+        @Override
+        protected void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException {
+            //super.reduce(key, values, context);
+
+            long sum = 0;
+
+            for (LongWritable value : values) {
+                //求key出现的次数和总和
+                sum += value.get();
+            }
+            //统计结果的输出
+            context.write(key, new LongWritable(sum));
+
+        }
+    }
+
+    /**
+     * 定义Driver,封装MapReduce作业的所有信息
+     */
+    public static void main(String[] args) throws Exception {
+
+        //创建Configuration
+        Configuration configuration = new Configuration();
+
+        //创建作业
+        Job job = Job.getInstance(configuration, "wordcount");
+
+        //设置作业的主类
+        job.setJarByClass(WordCountApp.class);
+
+        //作业处理的输入路径
+        FileInputFormat.setInputPaths(job, new Path(args[0]));
+
+        //设置map相关参数
+        job.setMapperClass(MyMapper.class);
+
+        //设置map输出的key的类型
+        job.setMapOutputKeyClass(Text.class);
+
+        //设置map输出的value的类型
+        job.setMapOutputValueClass(LongWritable.class);
+
+        //设置Reduce相关参数
+        job.setReducerClass(MyReducer.class);
+        job.setOutputKeyClass(Text.class);
+        job.setOutputValueClass(LongWritable.class);
+
+        //设置作业处理输出结果的输出路径
+        FileOutputFormat.setOutputPath(job, new Path(args[1]));
+
+        //作业提交
+        job.waitForCompletion(true);
+
+        //作业完成后退出
+        System.exit(job.waitForCompletion(true) ? 0 : 1);
+
+    }
+
+
+}