如何从 JsonSchema 中删除引号的反斜杠？

编程问答 2022-04-21

问题描述

我有一堂课：

# set margins
par(mai=c(0.5,0.3,0.2,0),xpd=TRUE)

#layout plot areas
layout(matrix(c(1,2,3,3),nrow = 2),widths = c(2,0.3))
layout.show(n=3)

#mfrow = c(2,1),#plot elevation vs time at the battery
plot(battery_1999~newbatterytime_1999,type="l",ylab="Elevation (m,NAVD88)",xlab="",col="black",xaxt="n")+ 
 
  #datetime axis labels by week
   axis.POSIXct(1,at=seq(newbatterytime_1999[1],newbatterytime_1999[12475],by="week"),format="%d-%b")+
  title("a. 1999",cex.main = 1.8,adj = 0,font.main = 4,line = 0.15)

#  add in lines for each well
lines(well1_1999~newwell1time_1999,col="red")
lines(well2_1999~newwell2time_1999,col="skyblue3")
lines(well3_1999~newwell3time_1999,col="skyblue1")
lines(well4_1999~newwell4time_1999,col= "skyblue")
lines(well5_1999~newwell5time_1999,col="slateblue")
lines(well6_1999~newwell6time_1999,col="slateblue2")
lines(well7_1999~newwell7time_1999,col="slateblue4")
lines(marshsurface_1999~newmarshsurfacetime_1999,col="springgreen2"
      )

#plot elevation vs time at the battery
plot(battery_2019~newbatterytime_2019,xaxt="n")+ 
  
  #datetime axis labels by week
  axis.POSIXct(1,at=seq(newbatterytime_2019[1],newbatterytime_2019[12475],format="%d-%b")+
  title("b. 2019",line = 0.15)

#  add in lines for each well
lines(well1_2019~newwell1time_2019,col="red")
lines(well2_2019~newwell2time_2019,col="skyblue3")
lines(well3_2019~newwell3time_2019,col="skyblue1")
lines(well4_2019~newwell4time_2019,col= "skyblue")
lines(well5_2019~newwell5time_2019,col="slateblue")
lines(well6_2019~newwell6time_2019,col="slateblue2")
lines(well7_2019~newwell7time_2019,col="slateblue4")
lines(marshsurface_2019~newmarshsurfacetime_2019,col="springgreen2"
)

# Create empty plot
plot(1,type = "n",axes=F,ylab="") 

#add legend on right
legend("right",#inset=c(5,legend=c("River","Levee","6m","12m","18m","24m","36m","48m","Marsh\nSurface"),lty=c(1,1,seg.len=0.75,col=c("black","red","skyblue3","skyblue1","skyblue","slateblue","slateblue2","slateblue4","springgreen2"),cex=1.5,bty="n"
)

# Title,x and y labels

mtext('Water Surface Elevation',line = .2,outer = TRUE,cex = 1.8,font = 2)
mtext("Date",side=1,line=.5,outer=TRUE,cex=1.3)
mtext("Elevation (m,side=2,line=1,cex=1.3,las=0)

我想返回字符串表示配置的样子。根据某些条件，这可以是不同的对象。

在我下面做的一项服务中：

class Setting {

    String configurationName;
    String configuration; 
}

可以有不同的类：“MysqLConfiguration.class”。

示例：

@GET
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response getConfigurationSetting ()
{
    try {

        Setting settingPojo = new Setting();
        settingPojo.setCOnfigurationName("DataBase");

        ObjectMapper mapper = new ObjectMapper();

        SchemaFactoryWrapper visitor = new SchemaFactoryWrapper();

        mapper.acceptJsonFormatVisitor(OracleConfiguration.class,visitor);

        JsonSchema schema = visitor.finalSchema();

        settingPojo.setConfiguraton(mapper.writeValueAsstring(schema));

        return Response.status(HTTP.CodeOK).entity(settingPojo).build();
    } catch (Exception ex) {
        // exception logic
    }
}

以上输出的问题：

  1. 我想从字符串中删除 id 属性。
  2. 对于转义字符，我收到了奇怪的额外反斜杠。在调试和执行这一行时我没有看到：mapper.writeValueAsstring(schema)。但是我在设置为属性后看到了反斜杠和额外的引号。

知道如何解决这些问题吗？

解决方法

  1. 您可以使用 Jackson 功能指示 id 删除 MixIn。看看example。
  2. 对象被序列化两次，一次由您在控制器方法中直接序列化，第二次 - 通过 Spring。

在您的示例中，您需要：
在 @JsonRawValue 类中使用 Setting 注释：

class Setting {
    String configurationName;

    @JsonRawValue
    String configuration;
}

创建一个 MixIn abstract class：

abstract class JsonSchemaWithoutId {

    @JsonIgnore
    public String id;

    @JsonIgnore
    public abstract String getId();
}

简单用法：

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonRawValue;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
import com.fasterxml.jackson.module.jsonSchema.factories.SchemaFactoryWrapper;
import lombok.Data;

import java.io.File;
import java.io.IOException;

public class JsonMixInAndSchemaApp {

    public static void main(String[] args) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(SerializationFeature.INDENT_OUTPUT);
        mapper.addMixIn(JsonSchema.class,JsonSchemaWithoutId.class);

        Setting settingPojo = new Setting();
        settingPojo.setConfigurationName("Setting");

        SchemaFactoryWrapper visitor = new SchemaFactoryWrapper();
        mapper.acceptJsonFormatVisitor(Setting.class,visitor);
        JsonSchema schema = visitor.finalSchema();

        settingPojo.setConfiguration(mapper.writeValueAsString(schema));

        mapper.writeValue(System.out,settingPojo);
    }
}

以上代码打印

{
  "configurationName" : "Setting","configuration" : {
  "type" : "object","properties" : {
    "configurationName" : {
      "type" : "string"
    },"configuration" : {
      "type" : "string"
    }
  }
}
}
jacksonjacksonjacksonjavajavajsonjson-serializationjsonschema