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hmkcodehmkcode
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servlet json
servlet json
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‎java-servlet-json/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src/test/java" output="target/test-classes" including="**/*.java"/>
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<classpathentry kind="src" path="src/main/java" including="**/*.java"/>
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<classpathentry kind="output" path="target/classes"/>
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<classpathentry kind="var" path="M2_REPO/javax/servlet/javax.servlet-api/3.1.0/javax.servlet-api-3.1.0.jar"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-core/2.2.2/jackson-core-2.2.2.jar"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-databind/2.2.2/jackson-databind-2.2.2.jar"/>
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<classpathentry kind="var" path="M2_REPO/com/fasterxml/jackson/core/jackson-annotations/2.2.2/jackson-annotations-2.2.2.jar"/>
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</classpath>

‎java-servlet-json/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.hmkcode</groupId>
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<artifactId>java-servlet-json</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>java-servlet-json</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>3.1.0</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-core</artifactId>
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<version>2.2.2</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.2.2</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-annotations</artifactId>
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<version>2.2.2</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>java-servlet-json</finalName>
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<plugins>
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<plugin>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-maven-plugin</artifactId>
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<version>9.0.4.v20130625</version>
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</plugin>
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</plugins>
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</build>
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</project>

‎java-servlet-json/src/main/java/com/hmkcode/JSONServlet.java

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package com.hmkcode;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.LinkedList;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.hmkcode.vo.Article;
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public class JSONServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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// This will store all received articles
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List<Article> articles = new LinkedList<Article>();
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/***************************************************
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* URL: /jsonservlet
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* doPost(): receives JSON data, parse it, map it and send back as JSON
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****************************************************/
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException{
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// 1. get received JSON data from request
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BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream()));
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String json = "";
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if(br != null){
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json = br.readLine();
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}
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// 2. initiate jackson mapper
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ObjectMapper mapper = new ObjectMapper();
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// 3. Convert received JSON to Article
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Article article = mapper.readValue(json, Article.class);
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// 4. Set response type to JSON
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response.setContentType("application/json");
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// 5. Add article to List<Article>
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articles.add(article);
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// 6. Send List<Article> as JSON to client
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mapper.writeValue(response.getOutputStream(), articles);
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}
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}

‎java-servlet-json/src/main/java/com/hmkcode/vo/Article.java

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package com.hmkcode.vo;
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import java.util.LinkedList;
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import java.util.List;
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public class Article {
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private String title;
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private String url;
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private List<String> categories;
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private List<String> tags;
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public String getUrl() {
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return url;
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}
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public void setUrl(String url) {
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this.url = url;
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}
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public List<String> getCategories() {
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return categories;
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}
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public void setCategories(List<String> categories) {
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this.categories = categories;
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}
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public List<String> getTags() {
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return tags;
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}
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public void setTags(List<String> tags) {
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this.tags = tags;
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}
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public void addCategory(String category){
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if(this.categories == null)
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this.categories = new LinkedList<String>();
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this.categories.add(category);
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}
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public void addTag(String tag){
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if(this.tags == null)
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this.tags = new LinkedList<String>();
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this.tags.add(tag);
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}
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@Override
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public String toString() {
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return "Article [title=" + title + ", url=" + url + ", categories="
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+ categories + ", tags=" + tags + "]";
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}
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}

‎java-servlet-json/src/main/webapp/WEB-INF/web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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id="WebApp_ID" version="3.0">
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<display-name>Java Servlet JSON</display-name>
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<welcome-file-list>
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<welcome-file>index.html</welcome-file>
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</welcome-file-list>
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<servlet>
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<servlet-name>jsonservlet</servlet-name>
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<servlet-class>com.hmkcode.JSONServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>jsonservlet</servlet-name>
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<url-pattern>/jsonservlet</url-pattern>
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</servlet-mapping>
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</web-app>

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