小编San*_*nde的帖子

我正在尝试从txt文件中收集JSON.但我的下面的代码似乎继续给我"nullPointerException".

File f = new File(tempDir+File.separator+'jsonObject.txt')
if (f){
    log.error " file exists $f"
    FileReader f2 = new FileReader(f);
    log.error " file data- $f2"
    if (f2 == null) {
        //do something
    } else {
        JsonSlurper jsonParser = new JsonSlurper();
        game = jsonParser.parse(new FileReader(f));
    }
} 

找到解决方案
读取json txt文件:

File f = new File(tempDir+File.separator+'jsonObject.txt')
def slurper = new JsonSlurper()
def jsonText = f.getText()
json = slurper.parseText( jsonText )

将json写入文件:

File g = new File(tempDir+File.separator+'jsonObject.txt')
            g.createNewFile()
            def json = new JsonBuilder()
            json { …