杰克逊注解，REST和JSON解析阵

问题描述

我要完成另一个程序员，在那里他开始与杰克逊注释项目和REST API。我与它没有任何经验，挣扎小时了。我需要解析JSON数组是这样的：

I have to finish project of another programmer, where he started with Jackson annotations and REST apis. I have no experience with it, and struggling for hours for now. I need to parse json array like this:

{
...
"id_s": "3011",
"no_s": "Suteki",
"fl": [
         {
             "v": "1",
             "m": "0",
         "id_fs": "243",
           "f_c": "2013-08-09 14:43:54",
          id_tf": "3",
           "u_c": "Aaa",
           _u_c": "1347678779",
             "c": "Carlos Rojas",
           "c_c": "1"
          }
      ]
}

现有的类是这样的：

Existing class is like:

@EBean
@JsonIgnoreProperties(ignoreUnknown = true)
public class Item implements Serializable, MapMarker {
private static final long serialVersionUID = 1L;

@JsonProperty("id_s")
protected int id;

@JsonProperty("id_sucursal")
public void setId_sucursal(int id_sucursal) {
    this.id = id_sucursal;
}

@JsonProperty("id_fb")
protected String idFacebook;

@JsonProperty("no_s")
private String name;

...
}

我读过here如何解析数组，但我怎么弄的 jsonResponseString 使用杰克逊的注解？我怎么错过？

I've read here how to parse array, but how do I get jsonResponseString using Jackson annotations? What do I miss?

谢谢！

推荐答案

除了缺少很多东西，这将有助于回答你的问题，我猜，你是不知道如何JSON阵列将映射到Java对象。如果是这样，它应该是直接的：你映射JSON数组作为任何Java数组或收藏 S（如列表 S）：

Aside from missing lots of things that would help answer your question, I am guessing that you are not sure how JSON Arrays would map to Java objects. If so, it should be straight-forward: you map JSON Arrays as either Java arrays, or Collections (like Lists):

public class Item { // i'll skip getters/setters; can add if you like them
  public String id_s;
  public String no_s;

  public List<Entry> fl;
}

public class Entry {
  public String v; // or maybe it's supposed to be 'int'? Can use that
  public String m;
  public int id_fs; // odd that it's a String in JSON; but can convert
  public String f_c; // could be java.util.Date, but Format non-standard (fixable)
  // and so on.
}

和你要么阅读JSON作为对象：

and you either read JSON as objects:

ObjectMapper mapper = new ObjectMapper();
Item requestedItem = mapper.readValue(inputStream, Item.class); // or from String, URL etc
// or, write to a stream
OutputStream out = ...;
Item result = ...;
mapper.writeValue(out, result);
// or convert to a String
String jsonAsString = mapper.writeValueAsString(result);
// note, however, that converting to String, then outputting is less efficient

我希望这有助于。

I hope this helps.

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