com.google.gson.JsonSyntaxException 解析简单 JSON 输入流时

Question

我在解析简单 JSON 输入流时得到 com.google.gson.JsonSyntaxException

我的json是这个。

{ "logdata"：[{ "millis": "1000", "light": "333" }, { "millis": "2000", "light": "333" } ] }

Java class -

import java.util.List;
public class Datalist {

private List<NavData> logdata;

/**
 * @return the logdata
 */
public List<NavData> getLogdata() {
    return logdata;
}

/**
 * @param logdata the logdata to set
 */
public void setLogdata(List<NavData> logdata) {
    this.logdata = logdata;
}

public class 导航数据 {

private String millis;

private String light;

/**
 * @return the millis
 */
public String getMillis() {
    return millis;
}

/**
 * @param millis the millis to set
 */
public void setMillis(String millis) {
    this.millis = millis;
}

/**
 * @return the light
 */
public String getLight() {
    return light;
}

/**
 * @param light the light to set
 */
public void setLight(String light) {
    this.light = light;
}

}

Json 输入流 Reader Class - 而 assetData 是上述 json.

的输入流

   JsonReader reader = new JsonReader(new InputStreamReader(assetData, "UTF-8"));
   Gson gson = new GsonBuilder().create();

   Datalist out = gson.fromJson(reader, Datalist.class);

   System.out.println(".."+out.getLogdata());

Answer 1

问题是因为您无法将字符串列表转换为包含以下项目的列表：

{
 "millis": "1000",
 "light": "333",
 "temp": "78.32",
 "vcc": "3.54"
}

如果您想转换为这些项目的列表，您需要用这些项目创建一个 class，属性将是：

@Expose
private List<NavData> logdata;

其中 NavData 是具有这些参数的 class

import com.google.gson.annotations.Expose;
public class NavData {
  @Expose
  private String millis;
  @Expose
  private String light;

  public String getMillis() {
      return millis;
  }
  public void setMillis(String millis) {
      this.millis = millis;
  }
  public String getLight() {
      return light;
  }
  public void setLight(String light) {
      this.light = light;
  }
}

读取输入流：

StringBuilder stringBuilder = new StringBuilder();
CharBuffer charBuffer = CharBuffer.allocate(1024);

while (yourInputStream.read(charBuffer) > 0) {
      charBuffer.flip();
      stringBuilder.append(charBuffer.toString());
      charBuffer.clear();
}

最后：

Gson gson = new GsonBuilder().enableComplexMapKeySerialization()
    .excludeFieldsWithoutExposeAnnotation().serializeNulls().create();

Datalist result = gson.fromJson(stringBuilder.toString(), Datalist.class);

com.google.gson.JsonSyntaxException 解析简单 JSON 输入流时

com.google.gson.JsonSyntaxException when parsing simple JSON Inputstream

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