GSON JavaオブジェクトとJSONの変換ライブラリ
① Mavenリポジトリの設定
<!-- リポジトリ -->
<repositories>
<!-- GSONのリポジトリ追加 -->
<repository>
<id>gson</id>
<url>http://google-gson.googlecode.com/svn/mavenrepo</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
<releases>
<enabled>true</enabled>
</releases>
</repository>
</repositories>
<dependencies>
<!-- Gson: Java to Json conversion -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>1.3</version>
<scope>compile</scope>
</dependency>
</dependencies>
② 使い方
== Bean.java ==
public class Bean {
private String a;
private Integer b;
private BBB[] bbbs;
public BBB[] getBbbs() {
return bbbs;
}
public void setBbbs(BBB[] bbbs) {
this.bbbs = bbbs;
}
public String getA() {
return a;
}
public void setA(String a) {
this.a = a;
}
public Integer getB() {
return b;
}
public void setB(Integer b) {
this.b = b;
}
}
== BBB.java ==
public class BBB {
private String c;
private String d;
public String getC() {
return c;
}
public void setC(String c) {
this.c = c;
}
public String getD() {
return d;
}
public void setD(String d) {
this.d = d;
}
}
== GsonTest.java ==
import com.google.gson.Gson;
import junit.framework.TestCase;
public class GsonTest extends TestCase {
protected void setUp() throws Exception {
super.setUp();
}
protected void tearDown() throws Exception {
super.tearDown();
}
public void testGson() throws Exception {
Bean bean = new Bean();
bean.setA("aa");
bean.setB(9);
BBB b1 = new BBB();
b1.setC("333");
b1.setD("3d3d");
BBB b2 = new BBB();
b2.setC("444");
b2.setD("4d4d");
BBB[] bbbs = { b1, b2 };
bean.setBbbs(bbbs);
Gson gson = new Gson();
String json = gson.toJson(bean);
assertNotNull(json);
// System.out.println(json);
Bean bean2 = gson.fromJson(json, Bean.class);
assertNotNull(bean2);
assertEquals(bean.getA(), bean2.getA());
assertEquals(bean.getB(), bean2.getB());
assertNotNull(bean2.getBbbs());
assertEquals(bean.getBbbs().length, bean2.getBbbs().length);
for (int i = 0; i < bean2.getBbbs().length; i++) {
assertEquals(bean.getBbbs()[i].getC(), bean2.getBbbs()[i].getC());
assertEquals(bean.getBbbs()[i].getD(), bean2.getBbbs()[i].getD());
}
}
}
楽だね（＾（エ）＾）
