java - Jackson JsonGenerator 将子对象插入为 JSON 文本

Question

我正在使用 Jackson 的 JsonGenerator 生成 JSON，并且希望从文本 JSON 字符串插入子对象。

gen.writeStartObject();
gen.writeStringField("name", "john");
gen.writeFieldName("profile");
gen.writeRaw(profilestring);
gen.writeEndObject();

这会导致

Could not write content: Can not write a field name, expecting a value; nested exception is com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value

有什么想法吗？

更新:使用解决

gen.writeRaw(",\"profile\":" + profilestring);

Answer 1

使用 writeRawValue 而不是 writeRaw 使生成器输出正确的标点符号并更新其状态(使用 2.5.3 测试):

@Test
public void write_raw() throws Exception {
    StringWriter sw = new StringWriter();
    String profileString = "{\"foo\":true}";
    try (JsonGenerator gen = mapper.getFactory().createGenerator(sw)) {
        gen.writeStartObject();
        gen.writeStringField("name", "john");
        gen.writeFieldName("profile");
        gen.writeRawValue(profileString);
        gen.writeEndObject();
    }
    assertThat(sw.toString(), equivalentTo("{name:'john',profile:{foo:true}}"));
}