package com.alibaba.json.bvt.serializer.filters; import junit.framework.TestCase; import org.junit.Assert; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.BeforeFilter; public class BeforeFilterTest extends TestCase { public void test_beforeFilter() throws Exception { BeforeFilter filter = new BeforeFilter() { @Override public void writeBefore(Object object) { this.writeKeyValue("id", 123); } }; Assert.assertEquals("{\"id\":123}",JSON.toJSONString( new VO(), filter)); } public void test_beforeFilter2() throws Exception { BeforeFilter filter = new BeforeFilter() { @Override public void writeBefore(Object object) { this.writeKeyValue("id", 123); this.writeKeyValue("name", "wenshao"); } }; Assert.assertEquals("{\"id\":123,\"name\":\"wenshao\"}", JSON.toJSONString(new VO(), filter)); } private static class VO { } }