ToStringBuilder.reflectionToString用法

本文深入探讨了Java中String、StringBuffer与StringBuilder的区别,解析了为何及如何重写toString方法以提高对象转JSON的效率,避免内存溢出问题。

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先上用例:

/**
	 * 重写对象toString方法
	 *
	 * @return String [field=value]...
	 */
	public String toString() {
		return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE);
	}

我们都知道String、StringBuffer、StringBuilder的区别(不明白的可以看下面)
Java平台提供了两种类型的字符串:String和StringBuffer/StringBuilder,它们可以储存和操作字符串。其中String是只读字符串,也就意味着String引用的字符串内容是不能被改变的,并且String的"+"操作在底层都会New对象所以在大量操作时就会占用大量内存。而StringBuffer/StringBuilder类表示的字符串对象的相关实现是通过在底层的二进制流直接操作所以可以直接进行修改。StringBuilder是Java 5中引入的,它和StringBuffer的方法完全相同,区别在于它是在单线程环境下使用的,因为它的所有方面都没有被synchronized修饰,因此它的效率也比StringBuffer要高。

回归正题:
这样我们就可以理解为什么这里需要重写toString方法了,防止因系统内存小的话引起的暴内存,而上述代码就做了让toString完成了对象转JSON的过程.

// // Source code recreated from a .class file by IntelliJ IDEA // (powered by FernFlower decompiler) // package io.choerodon.mybatis.domain; import com.fasterxml.jackson.annotation.JsonAnyGetter; import com.fasterxml.jackson.annotation.JsonAnySetter; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.annotation.JsonInclude.Include; import io.swagger.annotations.ApiModelProperty; import jakarta.persistence.Transient; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.commons.lang3.builder.ToStringBuilder; import org.apache.commons.lang3.builder.ToStringStyle; import org.hzero.mybatis.domian.SecurityToken; public abstract class AuditDomain implements SecurityToken { public static final String FIELD_CREATION_DATE = "creationDate"; public static final String FIELD_CREATED_BY = "createdBy"; public static final String FIELD_LAST_UPDATE_DATE = "lastUpdateDate"; public static final String FIELD_LAST_UPDATED_BY = "lastUpdatedBy"; public static final String FIELD_OBJECT_VERSION_NUMBER = "objectVersionNumber"; public static final String FIELD_TABLE_ID = "tableId"; @ApiModelProperty( hidden = true ) private Date creationDate; @ApiModelProperty( hidden = true ) private Long createdBy; @ApiModelProperty( hidden = true ) private Date lastUpdateDate; @ApiModelProperty( hidden = true ) private Long lastUpdatedBy; @ApiModelProperty( hidden = true ) private Long objectVersionNumber; @Transient @ApiModelProperty( hidden = true ) private String tableId; @Transient @JsonInclude(Include.NON_EMPTY) @ApiModelProperty( hidden = true ) private Map<String, Map<String, String>> _tls; @Transient @JsonInclude(Include.NON_NULL) @ApiModelProperty( hidden = true ) private String _token; @Transient @JsonInclude(Include.NON_EMPTY) @ApiModelProperty( hidden = true ) private Map<String, Object> _innerMap; @Transient @JsonInclude(Include.NON_NULL) @ApiModelProperty( hidden = true ) private RecordStatus _status; @Transient @JsonInclude(Include.NON_EMPTY) @ApiModelProperty( hidden = true ) private Map<String, Object> flex = new HashMap(32); @Transient @JsonInclude(Include.NON_NULL) @ApiModelProperty( hidden = true ) private String keyword; public AuditDomain set_innerMap(Map<String, Object> _innerMap) { this._innerMap = _innerMap; return this; } @JsonAnySetter public void set_innerMap(String key, Object value) { if (this._innerMap == null) { this._innerMap = new HashMap(); } this._innerMap.put(key, value); } @JsonAnyGetter public Map<String, Object> get_innerMap() { return this._innerMap; } public Date getCreationDate() { return this.creationDate; } public void setCreationDate(Date creationDate) { this.creationDate = creationDate; } public Long getCreatedBy() { return this.createdBy; } public void setCreatedBy(Long createdBy) { this.createdBy = createdBy; } public Date getLastUpdateDate() { return this.lastUpdateDate; } public void setLastUpdateDate(Date lastUpdateDate) { this.lastUpdateDate = lastUpdateDate; } public Long getLastUpdatedBy() { return this.lastUpdatedBy; } public void setLastUpdatedBy(Long lastUpdatedBy) { this.lastUpdatedBy = lastUpdatedBy; } public Long getObjectVersionNumber() { return this.objectVersionNumber; } public void setObjectVersionNumber(Long objectVersionNumber) { this.objectVersionNumber = objectVersionNumber; } @JsonInclude(Include.NON_NULL) public String getTableId() { return this.tableId; } public void setTableId(String tableId) { this.tableId = tableId; } public Map<String, Map<String, String>> get_tls() { return this._tls; } public AuditDomain set_tls(Map<String, Map<String, String>> _tls) { this._tls = _tls; return this; } public String get_token() { return this._token; } public void set_token(String _token) { this._token = _token; } public String toString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.DEFAULT_STYLE); } public String toJSONString() { return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE); } public RecordStatus get_status() { return this._status; } public AuditDomain set_status(RecordStatus _status) { this._status = _status; return this; } public Map<String, Object> getFlex() { return this.flex; } public AuditDomain setFlex(Map<String, Object> flex) { this.flex = flex; return this; } public String getKeyword() { return this.keyword; } public void setKeyword(String keyword) { this.keyword = keyword; } public static enum RecordStatus { create, update, delete; } }
最新发布
08-22
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