Question

解析简单的JSON Inputstream时，我收到com.google.gson.JsonSyntaxException

我的json就是这个。

{ “logdata”：[{ “millis”：“1000”， “光”：“333” }， { “millis”：“2000”， “光”：“333” } ] }

Java类 -

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 NavData {

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输入流读取器类 - 而assetData是上面json的inputStream。

   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"
}

如果要转换为这些项目的列表，则需要创建包含这些项目的类，该属性将为：

@Expose
private List<NavData> logdata;

NavData 是具有这些参数的类

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;
  }
}

阅读inputStream：

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);

解析简单的JSON Inputstream时出现com.google.gson.JsonSyntaxException

1 个答案: