我正在尝试替换返回 JSON 的旧 ASP 页面，该页面填充了流程图。 (http://www.flotcharts.org/)
我的问题是这样的，
旧的 ASP 页面返回此 JSON:
{"xaxis":{"ticks":[[100,"Location1"],[200,"Location2"],[300,"Location3"]]}}
如您所见，“ticks”包含具有 2 个成员的数组列表。每个数组的第一个成员是数字，第二个成员是字符串。
我能用 SpringMVC/SpringBoot 得到的最接近的是:
{"xaxis":{"ticks":[["100","Location1"],["200","Location2"],["300","Location3"]]}}
您会注意到这些数字实际上是字符串。
这是我正在使用的 Controller :
@Controller
public class GraphWebController {
@RequestMapping(value = "/getXAxisData", method = RequestMethod.GET)
public @ResponseBody Map<String, XAxisData> getXAxisData(Model model) {
String[] location1 = new String[]{"100", "Location1"};
String[] location2 = new String[]{"200", "Location2"};
String[] location3 = new String[]{"300", "Location3"};
List<String[]> xAxisLocations = new ArrayList<String[]>();
xAxisLocations.add(location1);
xAxisLocations.add(location2);
xAxisLocations.add(location3);
XAxisData xaxis = new XAxisData(xAxisLocations);
Map<String, XAxisData> xAxisData = new HashMap<String, XAxisData>();
xAxisData.put("xaxis", xaxis);
return xAxisData;
}
}
public class XAxisData {
private List<String[]> ticks;
public XAxisData(List<String[]> ticks) {
this.ticks = ticks;
}
public List<String[]> getTicks() {
return ticks;
}
public void setTicks(List<String[]> ticks) {
this.ticks = ticks;
}
}
我尝试将字符串数组更改为对象数组，并将带引号的数字更改为实际整数，但随后出现以下错误:对象无法转换为字符串。
<html><body><h1>Whitelabel Error Page</h1><p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p><div id='created'>Tue May 26 14:28:55 EDT 2015</div><div>There was an unexpected error (type=Internal Server Error, status=500).</div><div>Could not write JSON: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String; (through reference chain: java.util.HashMap["xaxis"]->springmvc.graph.XAxisData["ticks"]->java.util.ArrayList[0]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String; (through reference chain: java.util.HashMap["xaxis"]->springmvc.graph.XAxisData["ticks"]->java.util.ArrayList[0])</div></body></html>
如何获得与旧 ASP 页面完全相同的输出？
目前我对 hacky 解决方案持相当开放的态度。不过，越少越好。谢谢!
最佳答案
假设 XAxisData 类如下
class XAxisData {
private List<Object[]> ticks;
public XAxisData(List<Object[]> xAxisLocations) {
this.ticks = xAxisLocations;
}
public List<Object[]> getTicks() {
return ticks;
}
public void setTicks(List<Object[]> ticks) {
this.ticks = ticks;
}
}
你可以使用
Object[] location1 = new Object[] { 100, "Location1" };
Object[] location2 = new Object[] { 200, "Location2" };
Object[] location3 = new Object[] { 300, "Location3" };
List<Object[]> xAxisLocations = new ArrayList<>();
xAxisLocations.add(location1);
xAxisLocations.add(location2);
xAxisLocations.add(location3);
XAxisData xaxis = new XAxisData(xAxisLocations);
Map<String, XAxisData> xAxisData = new HashMap<String, XAxisData>();
xAxisData.put("xaxis", xaxis);
这会产生
{"xaxis":{"ticks":[[100,"Location1"],[200,"Location2"],[300,"Location3"]]}}
不过，如果您不打算拥有任何其他动态根 JSON 字段，我建议您将 Map 更改为 POJO。
关于java - 带有整数和字符串的 SpringMVC/SpringBoot JSON 数组，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30466230/