Java中将Map写入json文件中

1、将Map写入json文件中

Map<String,String> map = getAllSystemFactorIDAndNameMap();
        String filePath ="C:/Users/lin/stagingtest/backend-ft/src/test/resources/portfolio/template/";
        ObjectMapper mapper = new ObjectMapper();
        try {
            (new File(filePath), map);
        } catch (IOException e) {
            ();
        }

2、将json文件中的数据通过key 取出来使用

public String getValue(String requestKey){
    resourceFilePath = "/factor/request_data/";
	URL pathAsUrl = (resourceFilePath);
	StringBuffer originalFileContent = new StringBuffer();
	try{
	BufferedReader br = new BufferedReader(new FileReader(()));
	String s = null;
	while((s = ())!=null) {
	(s + "\n");
	}
	();
	}catch(Exception e){
	();
	}
	//add slash '\' for all ' " ' in string: {"a":1, "b":2 } -> {\"a\":1, \"b\":2}
	// return ().replace("\"", "\\\"");
	ObjectMapper mapper = new ObjectMapper();
	JsonNode jsonNode (());
	return (requestKey).asText;
}