fastjson 反序列化成类时报错，这绝对是一个bug，屡试不爽

f2uvfpb9 于 2022-10-21 发布在其他

关注(0)|答案(4)|浏览(385)

FastJsonConfig config = new FastJsonConfig();
config.setSerializerFeatures(new SerializerFeature[]{
SerializerFeature.WriteDateUseDateFormat,
SerializerFeature.WriteBigDecimalAsPlain,
SerializerFeature.QuoteFieldNames,
SerializerFeature.PrettyFormat,
SerializerFeature.DisableCircularReferenceDetect});

[
{
"auditStatus":30,
"id":"03ff2fea48184cdaaafbfc4d74432f5b",
"name":"公司",
"updateTime":"2021-06-03 14:30:58"
}
]
反序列化成类时报错
@DaTa
public class CompanySimpleVo {
private String id;
private String name;
private Date updateTime;
}

com.alibaba.fastjson.parser.JSONScanner#scanFieldDate

`
ch = charAt(++bp);//ch可能是空字符串换行符制表符等字符，如果是这样空字符串换行符制表符等字符，后面 matchStat = NOT_MATCH，导致异常
if (ch == ',') {
token = JSONToken.COMMA;
this.ch = charAt(++bp);
} else if (ch == ']') {
token = JSONToken.RBRACKET;
this.ch = charAt(++bp);
} else if (ch == '}') {
token = JSONToken.RBRACE;
this.ch = charAt(++bp);
} else if (ch == EOI) {
token = JSONToken.EOF;
} else {
this.bp = startPos;
this.ch = startChar;
matchStat = NOT_MATCH;
return null;
}
matchStat = END;

`

fastjson

来源：https://github.com/alibaba/fastjson/issues/4279

4条答案

按热度按时间

gupuwyp21#

版本号1.2.83

赞(0）回复(0）举报 2022-10-21

falq053o2#

`@Data
public class CompanyJsonBugTest {

/**
 * 首字母
 */

private Date updateTime;

private String id;
public static final FastJsonConfig FAST_JSON_CONFIG = configFastJson();

public static FastJsonConfig configFastJson() {
    FastJsonConfig config = new FastJsonConfig();
    //config.getParserConfig().setAsmEnable(false);//默认是true 

    config.setSerializerFeatures(new SerializerFeature[]{
            SerializerFeature.WriteDateUseDateFormat,
            SerializerFeature.WriteBigDecimalAsPlain,
            SerializerFeature.QuoteFieldNames,
            SerializerFeature.PrettyFormat,
            SerializerFeature.DisableCircularReferenceDetect});
    return config;
}
public static void main(String[] args) throws Exception {
    CompanyJsonBugTest bugTest = new CompanyJsonBugTest();
  //  bugTest.setAuditStatus(20);
  //  bugTest.setId("008e2562703c49a09fa5ca7dd151127b");
  //  bugTest.setName("企业全称");
    bugTest.setUpdateTime(new Date());
    List<CompanyJsonBugTest> companyJsonBugTests = new ArrayList<>();
    companyJsonBugTests.add(bugTest);
    FastJsonConfig fastJsonConfig = FAST_JSON_CONFIG;
    List<SerializeFilter> allFilters = new ArrayList<SerializeFilter>(Arrays.asList( fastJsonConfig.getSerializeFilters()));
   try( ByteArrayOutputStream outnew = new ByteArrayOutputStream()) {

       int len = JSON.writeJSONStringWithFastJsonConfig(outnew, //
               fastJsonConfig.getCharset(), //
               companyJsonBugTests, //
               fastJsonConfig.getSerializeConfig(), //
               //fastJsonConfig.getSerializeFilters(), //
               allFilters.toArray(new SerializeFilter[allFilters.size()]),
               fastJsonConfig.getDateFormat(), //
               JSON.DEFAULT_GENERATE_FEATURE, //
               fastJsonConfig.getSerializerFeatures());
       String string = outnew.toString();
       System.out.println(string);
       byte[] bytes = outnew.toByteArray();
       ByteArrayInputStream in = new ByteArrayInputStream(bytes);
       Method getCompanyJsonBugs = CompanyJsonBugTest.class.getDeclaredMethod("getCompanyJsonBugs");
       Object o = JSON.parseObject(in,
               fastJsonConfig.getCharset(),
               (Type) getCompanyJsonBugs.getGenericReturnType(),
               fastJsonConfig.getParserConfig(),
               fastJsonConfig.getParseProcess(),
               JSON.DEFAULT_PARSER_FEATURE,
               fastJsonConfig.getFeatures());
       System.out.println(o);

   }catch (Exception e){
       System.out.println(e);
   }

}

private List<CompanyJsonBugTest> getCompanyJsonBugs(){
    return null;
}

}`
经过反复试验，当去掉字段其他字段只保留updateTime,可以成功，添加其他字段就报错，
com.alibaba.fastjson.parser.JSONScanner#scanFieldDate中调用scanISO8601DateIfMatch
token = JSONToken.LITERAL_ISO8601_DATE;
return true;
返回true 并将token 设置成JSONToken.LITERAL_ISO8601_DATE导致后续在com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer#deserialze(com.alibaba.fastjson.parser.DefaultJSONParser, java.lang.reflect.Type, java.lang.Object, java.lang.Object, int, int[])第439行成为true，下面直接抛出异常
控制台打印结果
[
{
"updateTime":"2022-09-29 13:51:36"
}
]
com.alibaba.fastjson.JSONException: syntax error, expect {, actual iso8601, pos 0, fastjson-version 1.2.83

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lskq00tm3#

在以上代码基础上增加name字段
private String name;
运行正常
[
{
"name":"企业全称",
"updateTime":"2022-09-29 13:46:35"
}
]
[CompanyJsonBugTest(updateTime=Thu Sep 29 13:46:35 CST 2022, id=null, name=企业全称)]

赞(0）回复(0）举报 2022-10-21

z4bn682m4#

@wenshao 请帮忙看看

赞(0）回复(0）举报 2022-10-21