我尝试使用 Gson 将数据保存到 txt 文件中的 json 字符串，然后使用 Gson 恢复它。如果我在 eclipse 中做的话，一切都会顺利。但是打包成jar的时候，Gson会抛出异常。
这是保存文件的代码。
String gsonStr = gson.toJson(masterShips); // masterShips is ArrayList<Ship>
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter("D:\\master_ship.txt"));
writer.write(gsonStr);
} catch (IOException e) {
System.err.println(e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
System.err.println(e);
}
}
}
然后我使用此代码在 Eclipse 中读取该文件(并且它有效):
Scanner in = new Scanner(new FileReader("D:\\master_ship.txt"));
String str = in.nextLine();
Log.toDebug(str);
in.close();
JsonParser parser = new JsonParser();
JsonElement je = parser.parse(str);
JsonArray ja = je.getAsJsonArray();
for (int i=0; i<ja.size(); ++i) {
...
}
但是打包成jar后在cmd中运行，出现异常:
Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.
stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malform
ed JSON at line 1 column 4
at com.google.gson.JsonParser.parse(JsonParser.java:65)
at com.google.gson.JsonParser.parse(JsonParser.java:45)
at kan.util.Master.loadMasterShip(Master.java:44)
at kan.util.Master.load(Master.java:27)
at kan.Main.main(Main.java:22)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLeni
ent(true) to accept malformed JSON at line 1 column 4
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1386)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:531)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:414)
at com.google.gson.JsonParser.parse(JsonParser.java:60)
... 4 more
根据异常的提示，我更改了代码，在eclipse中仍然有效:
Scanner in = new Scanner(new FileReader("D:\\master_ship.txt"));
String str = in.nextLine();
in.close();
Reader reader = new StringReader(str);
JsonReader jr = new JsonReader(reader);
jr.setLenient(true);
JsonParser parser = new JsonParser();
JsonElement je = parser.parse(jr);
JsonArray ja = je.getAsJsonArray();
for (int i=0; i<ja.size(); ++i) {
...
}
但是 jar 失败并抛出
Exception in thread "main" java.lang.IllegalStateException: This is not a JSON A
rray.
at com.google.gson.JsonElement.getAsJsonArray(JsonElement.java:106)
at kan.util.Master.loadMasterShip(Master.java:58)
at kan.util.Master.load(Master.java:30)
at kan.Main.main(Main.java:22)
按照 Sotirios 的建议，我缩短了数组列表的长度，当我将船只数量增加到 4 时，出现了问题。这是 json:
[{"id":1,"name":"睦月","type":2,"rank":2,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":254,"range":1,"powerups":[1,1,0,0]},{"id":2,"name":"如月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":255,"range":1,"powerups":[0,1,0,0]},{"id":6,"name":"長月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":258,"range":1,"powerups":[0,1,0,0]},{"id":7,"name":"三日月","type":2,"rank":1,"fuelMax":15,"bulletMax":15,"slotNum":2,"speed":10,"afterLv":20,"afterId":260,"range":1,"powerups":[0,1,0,0]}]
↑ colunm 473
Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.
stream.MalformedJsonException: Unterminated object at line 1 column 473
at com.google.gson.internal.Streams.parse(Streams.java:56)
at com.google.gson.JsonParser.parse(JsonParser.java:84)
at kan.util.Master.loadMasterShip(Master.java:55)
at kan.util.Master.load(Master.java:30)
at kan.Main.main(Main.java:22)
Caused by: com.google.gson.stream.MalformedJsonException: Unterminated object at
line 1 column 473
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:480)
at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
666)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
659)
at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:
642)
at com.google.gson.internal.Streams.parse(Streams.java:44)
... 4 more
任何人都可以帮我解决这个问题，您将非常感激!
最佳答案
使用此类
import java.util.List;
public class GsonResponse
{
public int id;
public String name;
public int type;
public int rank;
public int fuelMax;
public int bulletMax;
public int slotNum;
public int speed;
public int afterLv;
public int afterId;
public int range;
public List<Integer> powerups;
/**
* @return the id
*/
public int getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(int id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the type
*/
public int getType() {
return type;
}
/**
* @param type the type to set
*/
public void setType(int type) {
this.type = type;
}
/**
* @return the rank
*/
public int getRank() {
return rank;
}
/**
* @param rank the rank to set
*/
public void setRank(int rank) {
this.rank = rank;
}
/**
* @return the fuelMax
*/
public int getFuelMax() {
return fuelMax;
}
/**
* @param fuelMax the fuelMax to set
*/
public void setFuelMax(int fuelMax) {
this.fuelMax = fuelMax;
}
/**
* @return the bulletMax
*/
public int getBulletMax() {
return bulletMax;
}
/**
* @param bulletMax the bulletMax to set
*/
public void setBulletMax(int bulletMax) {
this.bulletMax = bulletMax;
}
/**
* @return the slotNum
*/
public int getSlotNum() {
return slotNum;
}
/**
* @param slotNum the slotNum to set
*/
public void setSlotNum(int slotNum) {
this.slotNum = slotNum;
}
/**
* @return the speed
*/
public int getSpeed() {
return speed;
}
/**
* @param speed the speed to set
*/
public void setSpeed(int speed) {
this.speed = speed;
}
/**
* @return the afterLv
*/
public int getAfterLv() {
return afterLv;
}
/**
* @param afterLv the afterLv to set
*/
public void setAfterLv(int afterLv) {
this.afterLv = afterLv;
}
/**
* @return the afterId
*/
public int getAfterId() {
return afterId;
}
/**
* @param afterId the afterId to set
*/
public void setAfterId(int afterId) {
this.afterId = afterId;
}
/**
* @return the range
*/
public int getRange() {
return range;
}
/**
* @param range the range to set
*/
public void setRange(int range) {
this.range = range;
}
/**
* @return the powerups
*/
public List<Integer> getPowerups() {
return powerups;
}
/**
* @param powerups the powerups to set
*/
public void setPowerups(List<Integer> powerups) {
this.powerups = powerups;
}
}
只需在您解析的位置添加以下代码
String strJson = "[{\"id\":1,\"name\":\"睦月\",\"type\":2,\"rank\":2,\"fuelMax\":15,\"bulletMax\":15,\"slotNum\":2,\"speed\":10,\"afterLv\":20,\"afterId\":254,\"range\":1,\"powerups\":[1,1,0,0]},{\"id\":2,\"name\":\"如月\",\"type\":2,\"rank\":1,\"fuelMax\":15,\"bulletMax\":15,\"slotNum\":2,\"speed\":10,\"afterLv\":20,\"afterId\":255,\"range\":1,\"powerups\":[0,1,0,0]},{\"id\":6,\"name\":\"長月\",\"type\":2,\"rank\":1,\"fuelMax\":15,\"bulletMax\":15,\"slotNum\":2,\"speed\":10,\"afterLv\":20,\"afterId\":258,\"range\":1,\"powerups\":[0,1,0,0]},{\"id\":7,\"name\":\"三日月\",\"type\":2,\"rank\":1,\"fuelMax\":15,\"bulletMax\":15,\"slotNum\":2,\"speed\":10,\"afterLv\":20,\"afterId\":260,\"range\":1,\"powerups\":[0,1,0,0]}]";
GsonResponse gsonResponse = null;
try {
gsonResponse = new Gson().fromJson(strJson,
GsonResponse.class);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
关于java - Gson 抛出 MalformedJsonException 和其他异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20778497/