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<apex:page controller="one" action="{!save}">
    <apex:form >
        <apex:pageBlock id="one">
            <apex:pageBlockTable value="{!accs}" var="a">
                <apex:column value="{!a.id}"/>
                <apex:column value="{!a.name}"/>
                <apex:column >
                    <apex:commandButton value="click" action="{!save}" reRender="two">
                    <apex:param name="accountId" value="{!a.id}" assignTo="{!accid}"/>
                    </apex:commandButton>
                </apex:column>
            </apex:pageBlockTable>
            </apex:pageBlock>
            <apex:pageBlock id="two">
            <apex:pageBlockSection >
        <apex:pageBlockSectionItem >
              ID:{!accid}
        </apex:pageBlockSectionItem>
    </apex:pageBlockSection> 
        </apex:pageBlock>
     </apex:form>
</apex:page>