fix code

hutool-json/src/test/java/cn/hutool/json/writer/GlobalValueWriterMappingTest.java

@@ -0,0 +1,67 @@
+package cn.hutool.json.writer;
+
+import cn.hutool.core.convert.Converter;
+import cn.hutool.json.JSONConfig;
+import cn.hutool.json.JSONUtil;
+import lombok.Data;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class GlobalValueWriterMappingTest {
+
+	@Before
+	public void init(){
+		GlobalValueWriterMapping.put(CustomSubBean.class, (JSONValueWriter<CustomSubBean>) (writer, value) -> {
+			writer.writeRaw(String.valueOf(value.getId()));
+		});
+	}
+
+	@Test
+	public void customWriteTest(){
+		final CustomSubBean customBean = new CustomSubBean();
+		customBean.setId(12);
+		customBean.setName("aaa");
+		final String s = JSONUtil.toJsonStr(customBean);
+		Assert.assertEquals("12", s);
+	}
+
+	@Test
+	public void customWriteSubTest(){
+		final CustomSubBean customSubBean = new CustomSubBean();
+		customSubBean.setId(12);
+		customSubBean.setName("aaa");
+		final CustomBean customBean = new CustomBean();
+		customBean.setId(1);
+		customBean.setSub(customSubBean);
+
+		final String s = JSONUtil.toJsonStr(customBean);
+		Assert.assertEquals("{\"id\":1,\"sub\":12}", s);
+
+		// 自定义转换
+		final JSONConfig jsonConfig = JSONConfig.of();
+		final Converter converter = jsonConfig.getConverter();
+		jsonConfig.setConverter((targetType, value) -> {
+			if(targetType == CustomSubBean.class){
+				final CustomSubBean subBean = new CustomSubBean();
+				subBean.setId((Integer) value);
+				return subBean;
+			}
+			return converter.convert(targetType, value);
+		});
+		final CustomBean customBean1 = JSONUtil.parseObj(s, jsonConfig).toBean(CustomBean.class);
+		Assert.assertEquals(12, customBean1.getSub().getId());
+	}
+
+	@Data
+	static class CustomSubBean {
+		private int id;
+		private String name;
+	}
+
+	@Data
+	static class CustomBean{
+		private int id;
+		private CustomSubBean sub;
+	}
+}