Android用Gson解析JSON字串

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在volley架構中有一個 protected Response<Result<T>> parseNetworkResponse(NetworkResponse response){}函數。從伺服器上或者在緩衝中擷取的JSON字串在這個函數進行解析。

String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers, HTTP.UTF_8))    Result<T> result = GsonUtil.getResult(jsonString, mTypeToken);

我們可以定義一個GsonUtil類。裡面寫一些Gson和JSON相互轉化的功能函數。例如上用到的getResult函數。利用該函數擷取的Result<T>這個JavaBean。也就是返回的規範，該規範由前端開發人員和後台開發人員商量得出。既然得到的JavaBean，那麼我再要擷取JSON裡面的資料就像從一個類中擷取一個資料一樣簡單了。

public static <T> T getResult(String jsonData, TypeToken<T> type) {        Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();        return (T) gson.fromJson(jsonData, type.getType());    }

Result<T>類：例如：（後台返回的JSON字串形如：{"err":"success","errno":1,"rsm{"userId":"1","email":"?","password":"?","firstName":"胡","lastName":"安","gender":"1","photo":"/picture/userPhoto/1422624411423.PNG","autograph":"","introduce":"","createTime":"4天前"}}失敗返回{"err":"使用者不存在!",errno":0} ）

package whu.cn.whushare.bean;import com.google.gson.annotations.Expose;import com.google.gson.annotations.SerializedName;public class Result<T> {    @Expose    @SerializedName("currentPage")    private long currentPage;    @Expose    @SerializedName("pageSize")    private long pageSize;    @Expose    @SerializedName("allDataCount")    private long allDataCount;    @Expose    @SerializedName("nextPage")    private long nextPage;    @Expose    @SerializedName("errno")    private int code;    @Expose    @SerializedName("err")    private String msg;    private int total;    @Expose    @SerializedName("rsm")    private T content;    public Result(T result) {        this.content = result;    }    public Result(int code, T result) {        this.code = code;        this.content = result;    }    public long getCurrentPage() {        return currentPage;    }    public void setCurrentPage(int currentPage) {        this.currentPage = currentPage;    }    public long getPageSize() {        return pageSize;    }    public void setPageSize(int pageSize) {        this.pageSize = pageSize;    }    public long getAllDataCount() {        return allDataCount;    }    public void setAllDataCount(int allDataCount) {        this.allDataCount = allDataCount;    }    public long getNextPage() {        return nextPage;    }    public void setNextPage(int nextPage) {        this.nextPage = nextPage;    }    public int getCode() {        return code;    }    public void setCode(int code) {        this.code = code;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    public int getTotal() {        return total;    }    public void setTotal(int total) {        this.total = total;    }    public T getContent() {        return content;    }    public void setContent(T content) {        this.content = content;    }}

 

Android用Gson解析JSON字串