如何使用jackson将Json数组写入文件

我创建了一个Json文件,我想写java对象作为Array元素.我用杰克逊.

    try{
           String json;
           String phyPath = request.getSession().getServletContext().getRealPath("/");
           String filepath = phyPath + "resources/" + "data.json";
           File file = new File(filepath);
           if (!file.exists()) {
               System.out.println("pai nai");
               file.createNewFile();               
           }  
           json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(story);
           Files.write(new File(filepath).toPath(), Arrays.asList(json), StandardOpenOption.APPEND);    
    } 

这不是我想要的.它创建数据

{
  "storyTitle" : "ttt",
  "storyBody" : "tttt",
  "storyAuthor" : "tttt"
}
{
  "storyTitle" : "a",
  "storyBody" : "a",
  "storyAuthor" : "a"
}

我只需要创建一个Json数组,我在其中添加java对象,数据应该是这样的

[{
  "storyTitle" : "ttt",
  "storyBody" : "tttt",
  "storyAuthor" : "tttt"
}
,{
  "storyTitle" : "a",
  "storyBody" : "a",
  "storyAuthor" : "a"
}]

小智.. 17

Jackson提供了用于将JSON数据写入JSON文件的内置方法.你可以使用这些代码行

ObjectMapper mapper = new ObjectMapper();
ObjectWriter writer = mapper.writer(new DefaultPrettyPrinter());
writer.writeValue(new File("D:/cp/dataTwo.json"), jsonDataObject);
//new file(path of your file) 

并且jsonDataObject是您要在文件中写入的实际对象(即对象或数组).

Jackson提供了用于将JSON数据写入JSON文件的内置方法.你可以使用这些代码行

ObjectMapper mapper = new ObjectMapper();
ObjectWriter writer = mapper.writer(new DefaultPrettyPrinter());
writer.writeValue(new File("D:/cp/dataTwo.json"), jsonDataObject);
//new file(path of your file) 

并且jsonDataObject是您要在文件中写入的实际对象(即对象或数组).